Extend the beginning of shine-through between Frozen Heart and Elsa/Anna
Allow build mode to be set by command line args
Redefine [I] and [W] as "Non-words-mode" and "Words-mode"
Add more mini-modes for faster building
Add a simple san-check option
Reduce the shine-through-options TODO to just what's not done yet
Simplify the definition of partial build: all tracks will be built, they just aren't included