Read-only conversation has:
- a lock icon in the smartlist item
- no message send bar in the chat view
- no call actions available from the chat view header
- no call actions available from the smartlist context menu
- no double click to call

Change-Id: I0497b94038b450f0a0a22fc007de1281b7b2214d
Gitlab: #475

Gitlab: #477
Change-Id: Ie8be0721017f18de656874a0b82cc8d5a97276fa

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