This commit covers
• TH02/TH03/TH04/TH05's frame_delay() and frame_delay_2() (finally!)
• TH02/TH03/TH04/TH05's game_init_main()
• TH02's graph_copy_rect_1_to_0_16()
• TH03/TH04/TH05's cfg_load_resident_ptr()
• TH05's piano_setup_and_put_initial() and piano_render()
Part of P0264, funded by [Anonymous] and Blue Bolt.
That #pragma proves this to have been a separate translation unit… but
it at least sort of fits into `hud.cpp`. Could have gone either way.
Part of P0245, funded by [Anonymous], Blue Bolt, Ember2528, and Yanga.
By leaving out just the one `score_delta = 0;` assignment, ZUN created
a function with semantics so complex that it already required naming
all other score-related functions just to make sense of it.
Part of P0242, funded by Yanga.
nmlgc