* Adds fast text option
Changes previous "fast text" option to "skip text", and adds a new "fast text" option, which makes text appear 5 times faster.
* Fixes magic numbers
* Changes text speed to a slider (unfinished)
Got most of the code working, but only works upon reloading the game, unsure of how to fix this.
* Makes text speed adjustable via a slider
* Cleans up changes to z_message_PAL.c
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