(Intertwined enough that's it's easier to do in one patch.)

(1) /dev/es did not support state save, which could cause crashes and
    incorrect behavior after loading.

(2) NANDContentLoader tried to read all of a title's contents into
    memory when it was first opened.  Two issues:

- If any contents were missing, it bailed out.  However, with DLC,
  only some of the contents may be downloaded, as determined by the
  permission bits in the ticket.  Instead, return an appropriate error
  when a content is accessed that doesn't exist on the filesystem
  (don't bother checking the permission bits though).

- Everything was loaded into memory - even if it consisted of 3 GB of
  songs, which caused Dolphin to lag out for quite a while (and would
  fail on 32-bit).  Instead, open content on demand.

Removed unneeded PolarSSL directories.
Remove duplicate sha1 and md5 files.
Define out SSL test file writing.
Fix format string bug and warning.

Also update the comment headers for two functions in GCMemcard.cpp.