constant-text-fade-duration

[Enorovan]

Makes it so glyphs start fading in based on the progress of the typewriter, but the fading in of each individual glyph takes a constant amount of time

The fading should be smooth (based on dt), and should be resilient to changing the ConfigSystem::TextSpeed and ConfigSystem::SyncVoice mid-typewriting

Also fixes an issue where if you press 'advance' whilst the typewriter is cancelling (that is, you press 'advance' while it is typewriting so all glyphs start fading in immediately, and then press 'advance' again as these glyphs are still fading in), the cancellation would carry over to the next line as well, immediately cancelling it

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This is a deceptively complex change, as the glyph fading progress used to be a direct calculation from the animation progress—now only the start time is; the opacity of each glyph is updated accordingly by incrementing and decrementing the opacity dynamically

The DialoguePage's state is dependent on the typewriter's progress, so when reviewing please take careful consideration and verify whether this state machine can not break with this new implementation

- Pringles

[PringlesGang]

Overall structure is quite good

[PringlesGang]

The glyph start progress should be dependent on TextSpeed, and their end progress should be an offset away from that starting progress depending on TextFadeInDuration and the currently predicted remaining duration of the line, such that it ends TextFadeInDuration seconds after the beginning progress

[PringlesGang]