Update to GLUI 2.36.

Doesn't quite compile just yet.
Fix new warnings in new glui code.
Re-implement custom check_fit methods.
Add custom accessor methods.
Restore custom GLUI cursor functions.
Re-implement general mouse button handler.
Re-implement the rename and reposition methods.
Re-implement GLUI_StaticText::set_right_justify.
Re-implement GLUI_Checkbox::set_show_name.
Re-implement GLUI_EditText::get_event_key.

Seems a bit hackish though, but hopefully it works as intended.
Re-implement blocking windows.

There should be a simpler way to do this in GLUI... Somewhere at the
top-level instead?