* Shared memcards and memcard0 method core options are now only checked in retro_load_game and require a restart
* In retro_load_game, rsx_intf_open is called first before check_variables and alloc_surface
* check_variables no longer receives any params
* Ensure none of the renderers call SET_SYSTEM_AV_INFO before we're in retro_run
* Ensure the first iteration of retro_run checks core options even if they weren't updated yet
* Store the upscale shift when calling GPU_Init() and prevent calling delete on a null pointer in GPU_Rescale()
* make texture filter a runtime setting
* only init texture pipelines if the primitive is actually textured
* don't init_pipelines constantly, only when necessary
* these are declared elsewhere so no need to do it here, too
* cleanups courtesy of r5
* flip logic to be more intuitive
* switch back to temporary var
