QSerialPort buffering too slow on Windows.

Removes a possible hang on Windows

This was causing a MOC compiler warnings. Also removed an unused
control.

Also fixed bug where channel detection number had off by 1. Also
changed UI to show channel reversal.

Also uses new min/max/invalid widget display

- Updated to use RCChannelWidget
- Removed attitude control widgets
- Previous calibration values now shown when not actively calibrating

Without this, when you go to airframe config and the current config is
Simulation it will not be selected. Hence you won’t know what the
current config is.