macosx: Multiple GUI improvements follow j-b's and my approach to synchronise...

macosx: Multiple GUI improvements follow j-b's and my approach to synchronise the QT4 and OSX intfs, more to come
- "Use DVD Menus" is inverted now, so it's "No DVD Menus"
- 3 dots at the end of a menu-item's caption mean that the entry will trigger a window (following Apple's HIGL)
- removed the entries for "Report a Bug" and "License". The first isn't necessary as we got enough of them and users doing useable reports know how to do, the latter will re-appear in the to-be-re-designed About panel.
- additionally, removed useless occurences of vlc_bool_t in favour of BOOL
- preparations to add fps to Statistics