Restored FirmwareUpgrade.qml as it was beyond repair. Also fixed some issues that were present in the original, master version.
Added "hasAPMSupport" to QGroundControl global control. This is to determine if APM support is enabled or not.

Handle fmuv2/v3

Don't hideDialog when it doesn't flash

Switch to using firmware manifest for ArduPilot flashing

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

Update throttle % fact from VFR_HUD message

Add Throttle % as vehicle fact

Safer handling of missing params

Visual accel cal

Fix strange status text string truncation problem

Better visual spacing

Update for correct simple parameter semantics

Simple and Super-Simple flight mode support

Allow time adjust while playing

Full width status bar

Tree contains all commands

Save/Restore stream rates. Auto flight mode support

Remove unused code

Use regular sliders

PID tuning rate adjustment

PID Tuning rate adjustment

Turn on live updating for vehicle facts used in PID charts

Add support for tuning on/off live updating

Enable full screen / windowed toggle

Fix typo