Ported monster tank madness to lua

It would be nice, if someone could already have a look at this (style nits?),
although this is not completely finished yet (see [todo](https://github.com/abcdefg30/OpenRA/commit/6de0802962eed40328b381ec964ec1048a8861c7#diff-da0b70bbc22b6b4af2fbe96dd5c5a8b7R19)).

[This](https://github.com/abcdefg30/OpenRA/commit/6de0802962eed40328b381ec964ec1048a8861c7#diff-da0b70bbc22b6b4af2fbe96dd5c5a8b7R22) set to true can help testing.
Why `false`?