*Once an icon has been found, or found to not exist, save that info in

*Once an icon has been found, or found to not exist, save that info in
the E_App, update related aE_Apps, and send trigger change callbacks.

*Have all E_Apps stored in a hash of paths for faster lookup.

*Don't read in all the details of every app at startup, but do scan the
all directory so that we at least know the filenames.  Read in details
when needed.

*When searching the non path info of apps, read in data as needed.

Most app things should be faster now.  Some things may be slower, and
much more testing / tweaking will be done.

SVN revision: 26213