Smarter presentation of gathered apps and icons.

When gathering the installed apps and activities, they are now
presented in the format used in your typical appfilter.xml, making it
immediately usable for the themer on the receiving end.

Output to +appfilter.xml to make it appear at the top of the themer's
extracted folder.
Merge pull request #2 from SorenHolm/master

Smarter presentation of gathered apps and icons.