Gitlab: #492

Change-Id: I67c9c1eafe29ce8d8a150af2b914a15f9c74d7f2

gen-resources.py should be used to generate resources.qrc and
JamiResources.qml. Steps to add an image resource:
- add the resource file to the appropriate path under resources/
- run gen-resources.py
- use the newly available resource

Note: only icons and images will be represented by Qml properties.

The resource file generation may be made to run during CMake
configuration in a subsequent commit.

Some unused components were also removed during the refactor.

Gitlab: #477
Change-Id: I8e7f13d465031666be2bbadd5f29f9afc94d210d

1. Adjust QML main setup
2. Add resources.qrc for test and Qt Creator display
3. Change LRCInstance and ScreenInfo to QML Singletons
4. Move QML type registration entirely to qmlregister

Change-Id: I5c8a854173a2ec1f85ffa971707af262fa344505

1. New emoji picker by customizing emoji.js
2. New message bar ui (textarea, buttons, tooltips)
3. New pending files transfer container
4. Use MaterialToolTip for all PushButton

Change-Id: I05d0531c65c019ced42b04668a780919c8a4fac3