- Altitude slider not showing up
- Continue mission not showing up in action list

For Video Streaming usecase, QGroundControl doesnt support changing of
Video Source or URI settings. Restart of QGroundControl application was
required for the changes to get applied. The issue is now resolved by
restarting the video receiver pipeline with new video source/setting.

Signed-off-by: lbegani <lalit.kumar.begani@intel.com>

Update the user model to a single controller instead of multiple

Added a bit more separation between the Toolstrip and the Toolbar

Fixed a pile of bugs as well

Increasing a bit the bottom margin for the confirmation dialogs
Changed the color for the guidedActionConfirm dialog to the palette’s alertColor
Disabled onHeightChanged on ToolStrip for the time being as it was not working. I need to come back to this and see why it hides “optional elements” even though I have plenty of space for them.
Adjusted the color for disabled text so you can read it within the ToolStrip