Introduce OPK support. Load OPKs from /media (and subdirs) at startup
Insert the links in their respective category if possible

If the corresponding category does not exist on the current theme,
insert the link in the 'Applications' category.
Add the -r,--rootdir option to specify where to search for OPKs
Add the -p,--platform option to specify the platform for OPKs
Watch the OPK folder via inotify and automatically add new OPKs