Lakka menu display and icons
(shader_common.c) Style nits
(Menu) Move 'rgui' global variable to 'driver' struct
(Apple) Build fix
(360) Build fix
* Add 'null' frontend context driver (will come into use later on in
more important ways)
* RetroArch when compiled with menu support will now cleanly exit if
menu driver cannot be initialized properly
(PS3/Wii) Salamander build fix
(MSVC 2010) Build fix
(RARCH_CONSOLE) Can finally get rid of global_driver_init
Fix configure vars for lakka
(SoftFilters) Update 2xbr/2xsai/blargg_ntsc_snes_composite/blargg_ntsc_snes_rgb
Merge branch 'master' of https://github.com/libretro/RetroArch
Update menu_lakka_backend
(2xBR) Fix warning on PS3
Merge pull request #675 from lakkatv/lakka-integration

Lakka integration
Remove float FBO for GLES.

The extension doesn't work as a rendertarget anyways.
(Lakka) Style nits
(Menu) Make time/delta variables exposable to display driver
(Lakka) Start implementing iterate function more properly
(Lakka) Erase all copy-pasted code in menu_lakka_backend.c
(Authors) Add Lakka author to credits
(Lakka) Add fallback directory in case rgui->libretro_dir points
to nothing for core directory list