thirdparty: Add script to build libsepol
thirdparty: Add prebuilt libsepol for Android
mbtool: Add sepolpatch to patch SELinux policy

sepolpatch simply takes makes the init, init_shell, and recovery types
in the SELinux policy permissive.
mbtool: Minor fixes in logging
mbtool: Remount / as rw in case init remounts it as ro before mount_fstab runs
thirdparty: Switch to stable 2.3 version of libsepol
Add and fix .gitignore files
thirdparty: Compile valgrind in its own script
thirdparty: Split acl, attr, and patch into separate prebuilt tarballs
thirdparty: d-h.st -> dropbox

d-h.st seems to have a bug where files are randomly deleted when I try
to delete one specific file. It's quite frustrating to have to reupload
the tarballs all the time, so from now on, the prebuilt files will be
hosted on Dropbox.

Note: These are not rebuilds. The md5sums haven't changed.
thirdparty: Remove busybox: it's not needed anymore
mbtool: Patch SELinux policy before attempting to mount filesystems
StandardPatcher: Remove unused legacy argument
StandardPatcher: Add one more regex to match /sbin/mount lines
jfltepatcher: Build fix
libmbp: No longer need the Google Edition autopatcher now that we have mbtool
libmbp: Drop support for Slim Aroma Gapps

This gapps package is no longer being developed.
libmbp: Drop support for TriForce ROM

The ROM is no longer being developed and the patcher didn't support the
latest version anyway. Also, the autopatcher code was a bit too hackish
for my liking.
JfltePatcher: Remove unused constants