Update debug messages in GetListOfThemes function

git-svn-id: svn+ssh://svn.code.sf.net/p/cloverefiboot/code@3067 52d7a1c0-eba5-4e63-a9d7-e3186cd7c462
Add USE_APPLE_HFSPLUS_DRIVER macro

* If USE_APPLE_HFSPLUS_DRIVER macro is defined then the HFSPlus.efi
  driver is embed into CloverEFI instead of VBoxHfs.efi driver.

git-svn-id: svn+ssh://svn.code.sf.net/p/cloverefiboot/code@3068 52d7a1c0-eba5-4e63-a9d7-e3186cd7c462