Revert "FPV background, seems to work only in Win"

This reverts commit 026fdb94c6dbcfe3b4a53486f48af4d38e47a1c2.

Conflicts:
	kpilot/kpilotgui.py
Revert "Revert "FPV background, seems to work only in Win""

This reverts commit 81b69d22eeaf6732b22ace39a18b78329838f231.