This function is called from a few different places in the mobile code,
including from one special that is only executed when the
BattleTowerRoomMenu special returns with a non-zero code.

Since that special causes a blue "error" screen to appear, that looks
the exact same as the one you'd get when trying to connect from the
mobile trade corner/battle colosseum in a Pokémon Center's top floor,
and this function contains a bunch of japanese strings in a jumptable, I
think it's reasonable to assume it should be called
"DisplayMobileError".

This way we can easily use `BANK()` where appropriate, and it is more
tidy.

Create linker script and float all sections

This reverts commit e28b88f56d666484b994fc9cf28cc5d4cf50c803.

This is needed so that rgblink doesn't move them around after modifying
it's placement algorithm.

Signed-off-by: AntonioND <antonio_nd@outlook.com>