Tablet boot performance work

Mostly accomplished by delay loading Qml elements

Remove font query from QWidget side of code

For QWidget we will just use the Qt default font sizes. This removes
the extra QQuickWidget creation which breaks boot Qml Profiling

More work on viable MainWindowTest

Unit tests

Too flaky with problems that are likely unit test only problems

Fixing Trashcan Icon

Remove splash screen. Fixes #2028

Fix native function setting in android serial port

Ui changes

More editor changes

More UI changes for tablet

Getting rid of warning on Mac OS

Delete Icons for Don

Mission Editor usability changes

That was easy.
Merging