Replace ANTLR4 with homegrown LALR parser generator#38

Merged

jdpage merged 11 commits intomasterfrom pgen

Aug 8, 2018

+1,781-3,752

Commits on Aug 2, 2018

Replace ANTLR4 with homegrown LALR parser generator
jdpage
committed

Commits on Aug 3, 2018

Change how modes work to be less awkward to work with
jdpage
committed

Commits on Aug 4, 2018

Commits on Aug 5, 2018

Commits on Aug 6, 2018