[Sprint/HipsterHedgehog] client metadata and code refactor

• client metadata added to views, votes
• methods moved from the list stores to the models
• fixed activity editor error
• eslint with flow support added and configured
• added view reporting to discovery and groups feeds (api/v2/analytics/views/)
• added a debounce of 300ms in views reporting
• added error messages to activity actions
• fixed discovery gif optimization (when the image moves out of the screen)

closes #994 (closed) closes #993 (closed) closes #1000 (closed) closes #1002 (closed) closes #1003 (closed) closes #999 (closed) closes #953 (closed) closes #952 (closed) closes #997 (closed)

__tests__/activity/components/__snapshots__/Activity.js.snap

@@ -17,8 +17,7 @@ exports[`Activity component renders correctly 1`] = `
   <Pinned
     entity={
       ActivityModel {
-        "_list": null,
-        "_position": null,
+        "__list": null,
         "attachment_guid": false,
         "blurb": false,
         "comments:count": undefined,
@@ -34,8 +33,7 @@ exports[`Activity component renders correctly 1`] = `
         "mature_visibility": false,
         "message": "Message",
         "ownerObj": UserModel {
-          "_list": null,
-          "_position": null,
+          "__list": null,
           "getAvatarSource": [Function],
           "guid": "824853017709780997",
           "subtype": false,
@@ -75,8 +73,7 @@ exports[`Activity component renders correctly 1`] = `
   <OwnerBlock
     entity={
       ActivityModel {
-        "_list": null,
-        "_position": null,
+        "__list": null,
         "attachment_guid": false,
         "blurb": false,
         "comments:count": undefined,
@@ -92,8 +89,7 @@ exports[`Activity component renders correctly 1`] = `
         "mature_visibility": false,
         "message": "Message",
         "ownerObj": UserModel {
-          "_list": null,
-          "_position": null,
+          "__list": null,
           "getAvatarSource": [Function],
           "guid": "824853017709780997",
           "subtype": false,
@@ -149,8 +145,7 @@ exports[`Activity component renders correctly 1`] = `
         <ActivityActionSheet
           entity={
             ActivityModel {
-              "_list": null,
-              "_position": null,
+              "__list": null,
               "attachment_guid": false,
               "blurb": false,
               "comments:count": undefined,
@@ -166,8 +161,7 @@ exports[`Activity component renders correctly 1`] = `
               "mature_visibility": false,
               "message": "Message",
               "ownerObj": UserModel {
-                "_list": null,
-                "_position": null,
+                "__list": null,
                 "getAvatarSource": [Function],
                 "guid": "824853017709780997",
                 "subtype": false,
@@ -252,8 +246,7 @@ exports[`Activity component renders correctly 1`] = `
       <ExplicitText
         entity={
           ActivityModel {
-            "_list": null,
-            "_position": null,
+            "__list": null,
             "attachment_guid": false,
             "blurb": false,
             "comments:count": undefined,
@@ -269,8 +262,7 @@ exports[`Activity component renders correctly 1`] = `
             "mature_visibility": false,
             "message": "Message",
             "ownerObj": UserModel {
-              "_list": null,
-              "_position": null,
+              "__list": null,
               "getAvatarSource": [Function],
               "guid": "824853017709780997",
               "subtype": false,
@@ -321,8 +313,7 @@ exports[`Activity component renders correctly 1`] = `
       <Translate
         entity={
           ActivityModel {
-            "_list": null,
-            "_position": null,
+            "__list": null,
             "attachment_guid": false,
             "blurb": false,
             "comments:count": undefined,
@@ -338,8 +329,7 @@ exports[`Activity component renders correctly 1`] = `
             "mature_visibility": false,
             "message": "Message",
             "ownerObj": UserModel {
-              "_list": null,
-              "_position": null,
+              "__list": null,
               "getAvatarSource": [Function],
               "guid": "824853017709780997",
               "subtype": false,
@@ -385,8 +375,7 @@ exports[`Activity component renders correctly 1`] = `
     <MediaView
       entity={
         ActivityModel {
-          "_list": null,
-          "_position": null,
+          "__list": null,
           "attachment_guid": false,
           "blurb": false,
           "comments:count": undefined,
@@ -402,8 +391,7 @@ exports[`Activity component renders correctly 1`] = `
           "mature_visibility": false,
           "message": "Message",
           "ownerObj": UserModel {
-            "_list": null,
-            "_position": null,
+            "__list": null,
             "getAvatarSource": [Function],
             "guid": "824853017709780997",
             "subtype": false,
@@ -452,8 +440,7 @@ exports[`Activity component renders correctly 1`] = `
   <Actions
     entity={
       ActivityModel {
-        "_list": null,
-        "_position": null,
+        "__list": null,
         "attachment_guid": false,
         "blurb": false,
         "comments:count": undefined,
@@ -469,8 +456,7 @@ exports[`Activity component renders correctly 1`] = `
         "mature_visibility": false,
         "message": "Message",
         "ownerObj": UserModel {
-          "_list": null,
-          "_position": null,
+          "__list": null,
           "getAvatarSource": [Function],
           "guid": "824853017709780997",
           "subtype": false,
@@ -516,8 +502,7 @@ exports[`Activity component renders correctly 1`] = `
   <ActivityMetrics
     entity={
       ActivityModel {
-        "_list": null,
-        "_position": null,
+        "__list": null,
         "attachment_guid": false,
         "blurb": false,
         "comments:count": undefined,
@@ -533,8 +518,7 @@ exports[`Activity component renders correctly 1`] = `
         "mature_visibility": false,
         "message": "Message",
         "ownerObj": UserModel {
-          "_list": null,
-          "_position": null,
+          "__list": null,
           "getAvatarSource": [Function],
           "guid": "824853017709780997",
           "subtype": false,