RetroPie 2.4.2 is released

reworked vice c64 emulator – defaults with dispmanx, but should run without now without also. Comes with a default config which is better
suited for the pi. config now resides in /opt/retropie/configs/c64/ rather than home directory.
retronet improvements – now can enable on game launch from runcommand menu.
added vectrex libretro core
always reset framebuffer even when not switching screen mode in runcommmand.sh which should help some emulators that seem to leave the framebuffer in an unusable state.
fix for fmsx rom install
use dispmanx sdl by default for uae4all
use dispmanx sdl by default for dgen
mame4all configs moved to /opt/retropie/configs/mame/ rather than mame4all (to match existing structure)