Reimplement customized rx on top of ample-regexps
lua-rx: fix a typo in group-n definition
lua-rx: fix lua-name definition
Use lua-rx for Lua builtin matchers
Use lua-rx for multiline literal matchers
Use lua-rx for continuation line matchers
Use lua-rx for indentation modifier matchers
Use lua-rx for REPL prompt and traceback matchers