Adapted lib and makefile-engine paths in makefiles.
Fixed drawing of sorting buttons on top of file list.
Commented out the "Help" menu as there are currently no docs.
Fix building and adding icon as rdef.
Add vector icon and rdefs, assign "R" as add-on shortcut.
Converted the About.rsrc also to rdef.
Renamed the rdefs to use camel case as everything else does.
Merge pull request #1 from humdingerb/master

Small fixes, added icon