Only show debug group of keys when built for debug
Add Laurids Düllmann to credits
Add "Commands" button group + fix new button names
Add Philips key aliases

CONTENTS_MENU -> LIST
FORWARD -> CHANNEL_UP
BACKWARD -> CHANNEL_DOWN
Plist for key aliases, make resolving transparent

Alias resolving is now transparent to the rest of the application,
meaning key highlighting works in the key bindings view with no changes
to the view controller logic.