grafx - Extensible Java Graphics Package Code

In LevelTest, removing classes 'SidebarUpdatable' and 'NextBlockUpdatable',
replaced with class 'SubUpdatable' defined in CanvasSpitter, the parent class.

In ComputerPlayerTest, removing private inner classes 'SidebarUpdatable' and
'NextBlockUpdatable', and using class 'SubUpdatable' instead.

Removing private inner classes 'SidebarUpdatable' and 'NextBlockUpdatable' from
levelPlayback. Using SubUpdatable (defined in CanvasSplitter) instead.

Removing external class SubUpdatable as promised.

Committing external class SubUpdatable. The intention is to immediately remove
this class thereafter. Saving it in case I need to resurrect it later.

Adding inner protected static class SubUpdatable to CanvasSplitter so that code
would not have to be repeated. Not using this yet. Other changes are minor;
changing some local variables to final, changing signatures of some methods
from 'public' to 'protected'.

Moving the watermark down just a tad.

Increasing size of watermark font just a hair.

Changing DEFAULT_VID_FPS from 50 to 60. This seems to synch up better with
typical refresh rates. I don't know about Europe.

Adding file 'excellent-complex.blo'.