Disambiguate verb analyses according to argument

Verb analyses need to be disambiguated according to argument: subject for some verbs like तो/ती भात जेवलो/जेवले, object for others like त्यानं भात/पोळी खाल्ला/खाल्ली. Which argument to pick also depends on tense: तो/ती भात खातो/खाते. Especially असणे and other very common verbs often need disambiguation:

^आहे/असणे/असणे/असणे$

I'm not sure about the best way to use CG3's unbounded context for this, especially since the type of verb, the tense, the sentence structure, etc. all require very careful rules... @vin-ivar what do you think?