Build system: Automator core script generator task
Build system: Automator core script generator task

As that is file is, essentially, a clone of `mmd2en.rb` under separate
version control (so the Xcode project doesn’t break), generation should
be possible via Rake. Also fixes generation failing due to unescaped
`!` passed.

kopischke/mmd2en,kopischke/mmd2en