chg: changed style entry for default.button.border.size

chg: Took out call to vDeleteAllStyles() in the ubixDesktop destructor. ...

The parent class (vContext) handles the destruction and deletion of
     the style map and classes contained within.

add: added constructor for sPixelFormat style. ...

add: added style entry in the root node of the style tree for
     default.desktop.pixelformat
add: The uBixButton hard-codes the position (no feedback from the SDE yet)
chg: New work on the Launcher

add: created ubixDesktop class which holds the root node for the style tree. ...

chg: changed the ubixButton to inherit from a normal vButton class, and set
     the parent to the desktop.  Overrode style entry for the ubixButton
     for default.button.border.size
add: new root style entry: default.button.border.size
add: new root style entry: default.font.filename
add: new root style entry: default.font.color.foreground
add: new root style entry: default.font.color.background