Improvements and portability enhancements. Combine decompile.sh and makePatches.sh

Anyone poking around with these scripts would probably benefit from editing the
first several lines of each script to reflect their personal file system setup.

Things like ANDROID_HOME and PATCH_LOCATION are set to what I personally use
by default. I will at some point throw them all in a config file, when I decide
where I would like to store that config itself.