Add incremental parsing support#2527

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dberlin wants to merge 3 commits intoantlr:masterfrom

dberlin:incremental

Commits on Apr 7, 2019

Basic incremental parser working
dberlin
committed

Commits on Apr 22, 2019

Fix changed rule detection during IncrementalParserData walk
dberlin
committed

Commits on Apr 23, 2019

Don't create ranges where the token index offset is 0
dberlin
committed