This commit covers
• TH03/TH04/TH05's game_init_op()
• TH04/TH05's egc_copy_rect_1_to_0_16() (finally!)
Part of P0262, funded by [Anonymous] and Blue Bolt.
ZUN might have gotten the impression that the EGC can *only* work with
multiples of 16 pixels per load or store? Which might explain why…
Part of P0102, funded by Yanga.