UI/UX improvements and bugfixes

This new release improves the call user experience and resolves some issues

## Updated

• Brand new icon set
• In app screen sharing now shows a sticky notification to the user
• Sharing tools menu will present the user an action for stopping the screen sharing making clear whether the tool is running or not

Fixed

• User name and fullscreen button don't overlap with the navigation bar anymore
• Fixed some bugs related to user permissions
• Fixed some camera issues, now the camera is started only when strictly necessary