The virtual external storage can be inserted/extracted with the e key. This
has little effect because there is no way to access the storage (yet, a later
commit will change this). Except on ondio where the mmc needs to be
extracted before entering USB (like on real target).
Change-Id: I523402832f3b4ae71e0603b281aba4fb8592a897
Now all threads need to ack the connection like on real target, dircache is unloaded and playback stops accordingly.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31009 a1c6a512-1295-4272-9138-f99709370657