Video reinit causes the core to freeze momentarily, freezing audio and
flashing the window. Cores like dosbox-svn need to change fps quite often
(some DOS games even change fps mid-gameplay) and the video reinit becomes
very annoying.
Change this to not reinit the video driver unless CRT SwitchRes is enabled
or a max width/height change was requested.
* Refactored the way RetroArch sets the input state/poll callbacks, hopefully it's clearer now.
* The unnamed enum of poll type behaviors in core.h was moved to retroarch.h and is now named rarch_poll_type.
It represents polling behaviors implemented specifically by RetroArch.
First element starts at 1 to match the data encoding of RETRO_ENVIRONMENT_POLL_TYPE_OVERRIDE.
* Created rarch_set_input_cbs - sets different input state/poll callbacks based on a
rarch_poll_type parameter.
* Replaced the static variable core_poll_type_override in retroarch.c with a poll_type_lock flag
inside global_t's menu struct;
RETRO_ENVIRONMENT_POLL_TYPE_OVERRIDE will now call rarch_set_input_cbs and set poll_type_lock,
which blocks the user from changing behaviors from the menu.
* To follow the RETRO_ENVIRONMENT_POLL_TYPE_OVERRIDE spec, we now set poll_type_lock and call
rarch_set_input_cbs after calling unload_game.
* core_set/unset_netplay_callbacks will now set/unset poll_type_lock, preventing the
poll type from being changed by the user;
* The MENU_ENUM_LABEL_INPUT_POLL_TYPE_BEHAVIOR action will now call rarch_set_input_cbs if poll_type_lock
isn't set, which means poll type is changed on-the-fly.
done for Z-Turn board) - has some outstanding issues such as
very slow framebuffer software rendering output that needs to
be overcome before this becomes usable - community help needed
