The `credit_` prefix may seem redundant within the REIIDEN.CFG
structure, but consistency seems more important here. Makes it much
easier to follow how these fields are copied around.
Part of P0229, funded by Ember2528.
In all places visited during the next 6 pushes: The resident structure
and copies of its values, the packfile implementation, boss entities,
rendering font ROM glyphs to VRAM, and overall inconsistent code
between the three binaries.
Part of P0229, funded by Ember2528.