make the project compile on 10.9, using Xcode 5.1

bare minimum changes ... 150+ warnings ... but it runs
remove (unused) licensing related code
remove ShortcutRecorder localisations that aren't supported in DTerm
remove (unused) licensing related code - part 2
remove unused svn revisions script
remove license related image resources
remove license file type from Info.plist
rip out Sparkle ... old code is old

Maybe we are going to add a new and shiny version of Sparkle later ... but for now it feels good to get rid of a third of the warnings.
rip out Growl

... at least for now; we might add the newest Growl version back in, later
remove license steps from release checklist
add _ideas folder