This allows you to filter the list of parameters the widget displays.

This allows you to determine if full parameter list is ready if you
missed the parameterListUpToDate signal.

Also fixed bug in loadStyle

The dark css is the master and contains all style information. The
light css is the slave and only contains color information.

Handy for testing without a real board

QSerialPort buffering too slow on Windows.

Settings versioning is handled at the uppermost level with a version
stamp.

Conflicts:
	src/uas/QGCMAVLinkUASFactory.cc
	src/uas/QGCMAVLinkUASFactory.h