Add multi-screen support with extended video callback#210
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Introduce multi-screen capability and an extended video refresh callback so the core can stream an auxiliary (bottom) screen to the frontend. Adds environment commands RETRO_ENVIRONMENT_SET_MULTI_SCREEN_AVAILABILITY and RETRO_ENVIRONMENT_GET_MULTI_SCREEN_ACTIVE, types retro_video_refresh_ext_t, retro_multi_screen_info, retro_multi_screen_query, and retro_set_video_refresh_ext. Implements an option (melonds_aux_stream_bottom_screen) to enable streaming of the bottom screen, updates geometry and screen layout handling when enabled, and emits the auxiliary framebuffer via the new callback when active. Changes touch headers, core options, state, and rendering logic to support this behavior and to notify the frontend of available screens during load_game.
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Introduce multi-screen capability and an extended video refresh callback so the core can stream an auxiliary (bottom) screen to the frontend. Adds environment commands RETRO_ENVIRONMENT_SET_MULTI_SCREEN_AVAILABILITY and RETRO_ENVIRONMENT_GET_MULTI_SCREEN_ACTIVE, types retro_video_refresh_ext_t, retro_multi_screen_info, retro_multi_screen_query, and retro_set_video_refresh_ext. Implements an option (melonds_aux_stream_bottom_screen) to enable streaming of the bottom screen, updates geometry and screen layout handling when enabled, and emits the auxiliary framebuffer via the new callback when active. Changes touch headers, core options, state, and rendering logic to support this behavior and to notify the frontend of available screens during load_game.
Requires libretro/RetroArch#19019
Closes #205