Shiromino v.beta3-pre2

A few small changes in this release, mostly to the Pentomino C mode

Shiromino v.beta3-pre1

Very few changes to the user's end of things in this update: the code has been transforming slowly and I have yet to replace any major modules with their newer counterparts in the functioning code.

Shiromino v.beta2

Many new features added since beta1, including 3 new modes and significant improvements to the pentomino mode, as well as proper grade systems for each mode.