Rockbox

There have been frequent requests for a better
organizations of the .rockbox/Rocks directory,so here is
a patch.

This patch should be seen as the basis for a discussion
of how it could be done rather than "the" solution
(even more so than my organize .rockbox patch).

It adds the directories Applications, Demos, Games and
Viewers to the .rockbox/rocks directory.

I've changed the rockbox browser so it can browse
directories for plugins, so the code is almost independent
from the directory structure in .rockbox/Rocks.
The only exception is the Viewers directory where
all plugins that needs to be started by playing a file,
are located.

The Viewers directory is hidden when using the plugin
browser, because starting these plugins without
input is meaningless. I have chosen to exclude the
Viewers directory in the code rather than taking the
easy way out and call it .Viewers, because I think that
the directory structure should be built already at compile
time.

I've also attached a makefile patch to show how I think
the Rocks structure should be built. My makefile patch
is only a hack with at least one major drawback (you
have to add each plugin to the makefile) the proper way
would be to have the same structure in apps/plugins
as in .rockbox/rocks


.../Henrik