Refactored Tool a bit to have a method to get the results as a string via API + some other refactorings

[KOLANICH]

I need to embed ANTLR into an another tool, so I have implemented an API to do this. The API allows

• getting compilation results without saving them to disk;
• triggerring TestRig tools programmatically

@parrt

[parrt]

Hi. Unfortunately, I can't take any major changes to the internals at this point. sorry!

[KOLANICH]

What do you mean under at this point? Do you mean I have no time to merge them currently (why have the PR been closed then? Does the project have other contributors capable to review with write access capable to review this properly and make a decision?) or I don't think currently that these changes are needed, but in unknown distant future (>= 5 years) I may have reconsidered (essentially wontfix)?

[parrt]

Meaning the tool is mature, I've moved on really, and any changes could have widespread effects on thousands of existing projects I'm afraid. It's not worth the risk. Sorry.

[KOLANICH]

Thanks for stating that clearly. Could you, please, add to the Contributing clear criteria on what PRs have no chances to be merged?

[parrt]

Done. added generic 'no big changes' thing.

[parrt]

Sorry