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

Must memset structures before use.

Changed (selected) mission item color to primaryButton instead of buttonHighlight
Adjusted some colors for better contrast
Removed a few JavaScript exceptions caused by the order of object destruction

Instead of hardcoded "QGroundContorl" strings

Some android versions leave a focus arrow indicator turd in the
control. This gets rid of it.

Convert bool settings to SettingsFact

* Holds all the settings for the app
* Allows core plugin to override default values