Integrate antlr code from master branch

[msteiger]

There is not yet proper support for gradle builds, but adding libraries to individual modules can be done manually.

Using antlr sounds reasonable for parsing grammar files.

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[skaldarnar]

Which version would you chose? Does the current antlr v4 sound reasonable? Or is there any need to stick to v3?

[msteiger]

I think that version 4 is best.