Started work on some potential aux functions.
Test builtins are working.
Used luac and xxd to include lua source in binary.  Handle backslashes in filename slicers.  Added tup.rule(inputs, command, outputs) to shorten rule definitions.
Merge branch 'rendaw-lua' into helperfunctions
Removed tup. prefix on commands, since namespace pollution probably wont be an issue with packages disabled.  Fixed a bunch of issues with the builtins, tried some of them out in the tup build files.
Converted remaining tupfiles to use new utility functions.
Merged in recent changes.
Merged helpermethods, moved tupvars into builtins.  Added luaparser - I guess I didn't add it previously.