Better Music Unlock System and Selection

This patch improves the music unlock system:

Now tracks are permanently unlocked as you visit their biomes and added to the overall selection. In addition, when picking a non-recently-played track, the game will prioritize tracks that are unlocked from the current biome if they are not on the recently-played list. This should give a much better variety of music tracks played, while preserving the unlock progression through the biomes.

Other things:

• fixed the tooltip font settings so subscripts should render correctly on Linux (and should use the pixel-font/non-pixel-font toggle from the settings properly)

• fixed some other instances of labels to properly use the font settings

• BUGFIX: fixed an issue where even when the helmet was on it wouldn't render properly when first joining a session