Merge branch 'ps-4-compliance' into 'master'

Modify folder names to match namespace for psr-4 compliance

See merge request !141

extension.json

@@ -26,19 +26,19 @@
 	},
 	"callback": "Reverb\\Hooks::registerExtension",
 	"AutoloadClasses": {
-		"Reverb\\Api\\ApiNotifications": "includes/api/ApiNotifications.php",
+		"Reverb\\Api\\ApiNotifications": "includes/Api/ApiNotifications.php",
 		"Reverb\\Hooks": "includes/Hooks.php",
-		"Reverb\\Identifier\\Identifier": "includes/identifier/Identifier.php",
-		"Reverb\\Identifier\\InvalidIdentifierException": "includes/identifier/InvalidIdentifierException.php",
-		"Reverb\\Identifier\\SiteIdentifier": "includes/identifier/SiteIdentifier.php",
-		"Reverb\\Identifier\\UserIdentifier": "includes/identifier/UserIdentifier.php",
-		"Reverb\\Notification\\Notification": "includes/notification/Notification.php",
-		"Reverb\\Notification\\NotificationBroadcast": "includes/notification/NotificationBroadcast.php",
-		"Reverb\\Notification\\NotificationBundle": "includes/notification/NotificationBundle.php",
-		"Reverb\\Notification\\NotificationEmail": "includes/notification/NotificationEmail.php",
-		"Reverb\\Special\\SpecialNotifications": "includes/special/SpecialNotifications.php",
-		"Reverb\\Traits\\NotificationListTrait": "includes/traits/NotificationListTrait.php",
-		"Reverb\\Traits\\UserContextTrait": "includes/traits/UserContextTrait.php",
+		"Reverb\\Identifier\\Identifier": "includes/Identifier/Identifier.php",
+		"Reverb\\Identifier\\InvalidIdentifierException": "includes/Identifier/InvalidIdentifierException.php",
+		"Reverb\\Identifier\\SiteIdentifier": "includes/Identifier/SiteIdentifier.php",
+		"Reverb\\Identifier\\UserIdentifier": "includes/Identifier/UserIdentifier.php",
+		"Reverb\\Notification\\Notification": "includes/Notification/Notification.php",
+		"Reverb\\Notification\\NotificationBroadcast": "includes/Notification/NotificationBroadcast.php",
+		"Reverb\\Notification\\NotificationBundle": "includes/Notification/NotificationBundle.php",
+		"Reverb\\Notification\\NotificationEmail": "includes/Notification/NotificationEmail.php",
+		"Reverb\\Special\\SpecialNotifications": "includes/Special/SpecialNotifications.php",
+		"Reverb\\Traits\\NotificationListTrait": "includes/Traits/NotificationListTrait.php",
+		"Reverb\\Traits\\UserContextTrait": "includes/Traits/UserContextTrait.php",
 		"Reverb\\TwiggyWiring": "includes/TwiggyWiring.php",
 		"Reverb\\UserIdHelper": "includes/UserIdHelper.php"
 	},