Night mode (dark theme)
.
- Implemented dark mode switch
- Added saving actual mode
- Changed png icons to vector images
Webapp MR for the chat view, https://gitlab.com/gitlab-org/gitter/webapp/merge_requests/1232
git remote add charafau git@gitlab.com:charafau/gitter-android-app.git
git push charafau charafau/gitter-android-app-feat/dark_mode:feat/dark_mode
Closes https://gitlab.com/gitlab-org/gitter/gitter-android-app/issues/58