[openbeos] More Terminal Patches

To continue on from Daniels patches to Terminal, I've got a few more here.

These fix the few remaining stray GPL copyright notices, as the
original authors allowed us to do, and also moves a few more
preferences from the Preferences Panel back to where they should be in
R5.

In addition, the files ShellPrefView.cpp/h, TerminalApp.cpp/h,
TerminalWindow.cpp/h are now obsolete and can be removed.

As I don't have A: write access or B: a working CVS upstream, could
someone check this in for me?

Cian

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