Fixes the crash at the first Shadow in 0.2.3 (GPU command buffer overflow; the console showed an exception screen and shut down). Includes the 0.2.3 speed work: on the maintainer's New 2DS XL the game runs at about 30 fps in the field, at 88% of real time on average. Saves work, no sound yet. Battles past the first Shadow are not verified on hardware yet - reports welcome.