grafx - Extensible Java Graphics Package Code

In WeightedBlock inner class, bumping up the max weight from 100 to 200. We're
going to be using that value in the 7-er block level.

Fixing a Javadoc issue in LocalBlockoutBoard.

Making the synchronized blocks in SillyQ optional.

Fixing a warning in Javadoc, in PCFFont.

Fixing a slight problem in Javadoc, in SNDFileCreator.

Doing some work on level 28.

Adding 'excellent7.blo' and 'excellent8.blo'.

Changing level 21 slightly.

Adding some intricacies to ComputerPlayer. Defining m_dropped field which is
used during a race condition w.r.t. user drops and system drops. The method
run_dropBlock() now takes a boolean input parameter, 'isBlockTouchingBottom'.
The changes made here are purely theoretical and have not been tested. About
to do that. Compiles successfully though.

NewBlockStartsEvent given a new member, which exposes isBlockTouchingBottom().
As a result EventEncoder and SimpleGameLogic had to be changed as well. Adding
member variable m_touchingBottom to class SimpleGameLogic, which tells if the
current playing block (in the case that it is in play) is grazing the bottom
(either the bottom of pit boundary or grazing frozen cruft below). That new
member variable is used in the following situation. When the block is already
touching bottom and when the user drop sequence is initiated, instead of
freezing the block immediately, the block is given m_hitBottomDelay
milliseconds before freezing in order to be able to perform some final post
drop sequence of events. The computer player needs this logic, because there
is no way to poll these kinds of situations; in particular if the computer
player initiates a user drop but at the same exact time a system drop block
event is created, then before, there would be no chance to perform post drop
events, and now with this change, a small time window is available to perform
these movements.