Fix tags file to proper format, ugh I hate Windows!

ctags -R on Windows of course, generates DOS style pathing '\' which
confounds vim on UNIX machines...ffs.
Begin minimal support for scripting.

Uber-crappy bit of code supplied for using Rhino.
New sxeTarget's. See settings.gradle.
Commit new version of helper Makefile.
Drop scripts/tags.sh
add scripting/rhino/.gitignore