Allow typewriter theming, add typewriter clear button, add piano outline colour #195
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Allows the typewriter to be themed. I edited the texture for the typewriter to add a couple of new colours (which are still black) to the palette so the outline and key labels can be set independently.
Also adds a "clear" button which just sets the typewriter's text to an empty string. (closes #190)
Also adds another colour for the piano's outline. I have updated some default themes to also use this new typewriter theming, here are screenshots:
Sky
Velocity

Sand

Neon (which I also gave custom piano key colours)

Concrete

bye2theme

Bubblegum
