grafx - Extensible Java Graphics Package Code

Adding some comments mostly, to SimpleGameLogic. In special tweak to
m_nextDropDue, using Math.max() now.

A bit more fine-grained information in m_pendingRot. It is now 0x00, 0x01, or
0x02. 0x02 is for the failed rotation/inversion events.

Fixing Javadoc in AddLayersFromBottomSoonListener.

Improving Javadoc in GenerateBlocks.

Improving Javadoc in ImprovedBlockSource.

Removing class OrigImprovedBlockSource because it is not being used.

Adding limited visibility constructor to BlocksConfig to make the Javadoc
cleaner-looking.

Adding some better Javadoc to Blocks and to BlocksConfig.

Adding slightly better Javadoc to Blocks.

Working on better Javadoc, better comments, and even added some commented out
error checking code. BlockGenerator and GenerateBlocks.