Add access to SteamAPI_RestartAppIfNecessary
Merge remote-tracking branch 'upstream/master' into feature-appstart

Conflicts:
	lib/src_linux/com/amanitadesign/steam/FRESteamWorks.as
	src/FRESteamWorks/FRESteamWorks.cpp
	src/functions.h
Merge branch 'feature-appstart'