grafx - Extensible Java Graphics Package Code

Now that BlockPlacementStrategy has been optimized and now that it runs more
quickly, increasing qSearchBreadth in ComputerPlayerLevelAction from 16 to 20.

Making level 29 a wee bit harder.

All comment and error message changes, in BlockPlacementStrategy. The
proofreading with a fine-toothed comb is nearing an end. I will likely test
extensively with various levels, but I also want to redo the order in which
xOff and yOff are set, to start from center and move towards outside.

Comment and style changes.

Adding a little bit of a Javadoc comment to BlockPlacementStrategy.

Removing unused import statement for HalfPosition.

Making massive changes to BlockPlacementStrategy, finally. Still need to do a
major proofread, esp. in function getNBestMovesFin(). Major changes on
priority of post drop slide moves.

In net.blockout.meta.BlockGenerator, making getBlockName(Layer[]) public since
that does not depend on center of block rotation. Also adding a new function,
getBestCanonicalRotation(), and adding necessary code to support it.

Very minor changes, mostly comments in code. Taking out an unnecessary
inequality check.

This is part of an incremental change, which is redoing getNBestMoves() in
BlockPlacementStrategy. This is a semi-stopping point, I want to save the work
in case I need to roll back. The game seems to work fine in this state, but
the changes are unfinished. Need to go over the code with a fine-toothed comb
still, at the very least.