TWRP-ify AOSP code

Pull in most TWRP sources
Stub out partition management code
Make it compile -- probably will not boot
Kind of a mess but have to start somewhere
diff --git a/prebuilt/bbinstall.sh b/prebuilt/bbinstall.sh
new file mode 100755
index 0000000..c59fec2
--- /dev/null
+++ b/prebuilt/bbinstall.sh
@@ -0,0 +1,9 @@
+#!/sbin/sh
+
+for cmd in $(/sbin/busybox --list); do
+	/sbin/busybox ln -s /sbin/busybox /sbin/$cmd
+done
+
+ln -sf /sbin/pigz /sbin/gzip
+ln -sf /sbin/unpigz /sbin/gunzip
+rm /sbin/mkdosfs
\ No newline at end of file