Little-endian BCD, again… Far less crazy than in TH04 and TH05,
though, thanks to updating and rendering being two different functions
here.
Part of P0070, funded by KirbyComment.
Rule of thumb going forward: Everything that emits data is .asm,
everything that doesn't is .inc.
(Let's hope that th01_reiiden_2.inc won't exist for that much longer!)
Part of P0032, funded by zorg.