Checking in some half-finished additions to caret selection.
Checking in some half-finished additions to caret selection.

mpasternak/michaldtz-fixes-518-522,cledio66/pyglet,arifgursel/pyglet,xshotD/pyglet,google-code-export/pyglet,Austin503/pyglet,mpasternak/pyglet-fix-issue-518-522,kmonsoor/pyglet,Alwnikrotikz/pyglet,shaileshgoogler/pyglet,mpasternak/michaldtz-fix-552,kmonsoor/pyglet,mpasternak/pyglet-fix-issue-552,gdkar/pyglet,mpasternak/pyglet-fix-issue-552,mpasternak/michaldtz-fix-552,mpasternak/michaldtz-fixes-518-522,Alwnikrotikz/pyglet,cledio66/pyglet,shaileshgoogler/pyglet,mpasternak/pyglet-fix-issue-518-522,shaileshgoogler/pyglet,shaileshgoogler/pyglet,mpasternak/pyglet-fix-issue-552,qbektrix/pyglet,xshotD/pyglet,odyaka341/pyglet,xshotD/pyglet,kmonsoor/pyglet,google-code-export/pyglet,gdkar/pyglet,qbektrix/pyglet,Alwnikrotikz/pyglet,Alwnikrotikz/pyglet,xshotD/pyglet,odyaka341/pyglet,odyaka341/pyglet,gdkar/pyglet,Austin503/pyglet,odyaka341/pyglet,cledio66/pyglet,mpasternak/michaldtz-fixes-518-522,Alwnikrotikz/pyglet,qbektrix/pyglet,google-code-export/pyglet,mpasternak/pyglet-fix-issue-518-522,mpasternak/pyglet-fix-issue-552,Austin503/pyglet,odyaka341/pyglet,mpasternak/michaldtz-fix-552,mpasternak/michaldtz-fixes-518-522,google-code-export/pyglet,kmonsoor/pyglet,cledio66/pyglet,gdkar/pyglet,qbektrix/pyglet,qbektrix/pyglet,Austin503/pyglet,cledio66/pyglet,kmonsoor/pyglet,arifgursel/pyglet,arifgursel/pyglet,gdkar/pyglet,google-code-export/pyglet,arifgursel/pyglet,mpasternak/pyglet-fix-issue-518-522,arifgursel/pyglet,Austin503/pyglet,xshotD/pyglet,mpasternak/michaldtz-fix-552,shaileshgoogler/pyglet