[SVN] r8011

[Ciarán Walsh]

Added support for section headers for popup menus. Sample usage:

require ENV['TM_SUPPORT_PATH'] + '/lib/ui'
TextMate::UI.menu([
  {'title' => 'foo', 'header' => 1},
  {'title' => 'bar'},
  {'title' => 'bar'},
  {'title' => 'foo', 'header' => 1},
  {'title' => 'bar'},
  {'title' => 'bar'},
])

Items with a non-zero 'header' value will be treated as a section header (which is not selectable).
Once a section header is encountered, all regular items under it will be indented.

Changed:
U   branches/WIP/Tools/Dialog PlugIn/Dialog.mm