Feature Request: indent dedent tocken support for any language

[Lupus590]

I want to be able to use blockman with Lua files, unfortunately, Lua doesn't have clear block tokens (its keywords do double duty). Being able to allow any language to piggyback on the current python support system will expand the feature to many languages at least partially.

Alternatively, proper Lua support would be appreciated, perhaps allowing the user to provide a list of words that start a block and what ends that block. Having these be language-specific like #22 wants would be even better.

[leodevbro]

I hope I'll try it in the near future.