Switch to luautil library
Add support for key-value flags
Use util.flags library for command line processing, add --config-dir flag
Update Emufun to use LOVE 0.9.1
Update deploy.sh for 0.9.1

A bunch of changes here. The obvious one is the change to the download
targets and zip names, but the UI has also changed (it now always
deploys the current branch). It also downloads a binary for LFS and
*patches the DLL* to use the same lua DLL name as love2d itself, so that
we don't end up with duplicate loads of liblua.