Added 'Recent Projects' menu (ref #305).
Disabled current project on the recent projects list (ref #305).
Added filetree popup menu with the list of projects (ref #305).
Added setting project directory by renaming the filetree root element (#305).
Updated filetree menu to use 'Edit Project Directory' on root element (#305).
Added Recent Project menu refresh after switching projects (ref #305).
Updated file sorting to be case-insensitive on all platforms.
Fixed right-click handling in filetree on OSX broken by 3709f61f (ref #166).
Updated love2d interpreter to not hide the application window.
Updated 'window unhide' logic (Windows only) to be called less frequently.