* Text data cleanup!
Reformatted and fixed up all of data/text/, and extended charmap.txt
The `#P` metacharacter (prompt) acts like a newline, so I reformatted it as such.
All `.string` macros followed by `.byte 0x00` have been replaced with `.asciz` where possible, and `.string "...\0"` elsewhere, note that `.asciz` does not respect the charmap, so characters such as 'é' in 'Pokémon' or the various buttons would be incorrectly encoded.
Also cleaned up occurences of `.byte 0x24`, which should just be a literal '$' inside the string.
* Nuke all instances of `.asciz`
As discussed on Discord, globally replaced all `.asciz` macros with `.string "...\0"`, as `.asciz` did not respect the charmap.
* Minor string consistency fixes
