Updated deprecated calls

[Nadahar]

I've updated all calls that's marked as deprecated by UMS to their modern day counterparts. I've also removed unused imports, fixed some memory leaks (opened streams not getting closed) and avoided an exception if the cookie file doesn't exist.

It all compiles and runs fine, and I can browse a bunch of folders, but I didn't understand enough about the configuration to actually test it playing anything. Except from that small bugfix, I haven't changed anything that should give any different results than before though.