grafx - Extensible Java Graphics Package Code

Importing net.blockout.impl.BlockPlacementStrategy.Move to be able to refer to
class 'Move' directly, greatly reducing verbosity of code in certain sections.
Local variable 'TreeMap<Long, Move> qBestMoves' now uses generics, is
parameterized with proper types. With m_postDropActionExec, now only changing
the operation bits one by one as the moves are made and detected; leaving the
negate bits alone. No longer assuming direct correlation between
AttemptedBlockMovementEvent.X_AXIS & Move.POST_DROP_SLIDE_X,
AttemptedBlockMovementEvent.Y_AXIS & Move.POST_DROP_SLIDE_Y, rather assigning
these in a 'switch' statement.

Refining some comments in BlockPlacementStrategy.

Utilizing Java generics & fixing major problem with POST_DROP_* bits in class
BlockPlacementStrategy.Move. There was a problem with post drop rotations,
with the z axis rotation in particular.

Adding enough requestUpdate() calls so that a blank screen would not happen
with JVMs that have some weaknesses. I really don't like this way of doing
things, yet I don't seem to have control over the quality of the now-Oracle
controlled JVMs. The audio modules are also quite stubborn and buggy.

In levels 21 & 22, changing height of pit (z value) from 10 to 11. More space
in case the block sequence is unfavorable by chance, so there's more room to
recover.

Adding 'very-tricky.blo'.

Fine-tuning level 21.

Adding 'excellent4.blo'.

Minor adjustments on some of the new levels.

Adding 'excellent3.blo'.