* 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.
Adds an option to start wireless access point directly from RetroArch
settings menu (Services submenu). This wireless access point can be then
used for local netplay. If not defined in a specific config file
(LAKKA_LOCALAP_PATH), the arbitrary values for SSID/PassKey of the
created access point are LakkaAccessPoint/RetroArch. The menu/option is
added only in case when compiling with HAVE_LAKKA.
overhead - maybe a slight dip from fullspeed/60fps to 59.90/59.10fps at
worse when flicking through playlist entries for the first time (it's
cached after first viewing) - after 1.7.8 we can further micro optimize
this
