Tweak combobox visuals

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Fixed places where the font family was not being defined (therefore using the default system font)

Fixed flight widget position.

Fix startup crash on initial font change signalling qgc reboot required

Fixed inverse logic in camera parameter retry count
Skip close timeout if not Windows

Testing on iPad Mini

Added top/bottom alignment state to map scale
Allow disabling instrument widget altogether
Added an otherwise redundant row to PlanToolbar so it matches the same button position as the main toolbar
Fixed typo (Math.max()) in ScreenTools
Fixed Javascript Exception in OfflineMap
Increased the import window size in OfflineMap
Added function to MainWindow to disable toolbar for a truly modal dialog
Added code so clicking on an open toolbar indicator will cause it to close

Shows touch area extents when turned on

Allow plugin to define default font size, toolbar height and option to display/hide plan view selector.

Also updated some docs