For some reason I thought BattleAnim_Ret was never used, due to how the
battle anim loop would be exited early from. It seems I was wrong.
Removing commands before anim_ret without it being part of the `enum`
seems to break things.
Some of the TX_ commands didn't use the TX_ prefix for their
constants, and the label names were inconsistent. I've chosen to adopt
the `TextCommand_` prefix as opposed to `Text_`, as it has a clear
difference in namespace compared to the possibly-used `Text_` namespace
for actual dialogue text.
`hittarget` was misleading, as it doesn't actually "hit" the target, it
only plays the animation. As such, I've renamed it to `moveanim`.
`checkfaint` has nothing to do with checking if the user or target has
fainted, instead, it applies wCurDamage onto the target's HP, hitting
the substitute if applicable. I've renamed the command to `applydamage`
and all of its subfunctions accordingly.
