Improve PredictionContext performance, fix bugs#4196

Merged

parrt merged 5 commits intoantlr:devfrom

jimidle:feature/lesspointy

Mar 28, 2023

Commits on Mar 19, 2023

feat: Stop using pointers for INterval class
jimidle
committed

Commits on Mar 20, 2023

feat: Refactor PredictionContexts so that it does not use an interface
jimidle
committed
feat: Remove ocde and structs that are now replaced
jimidle
committed
feat: Incorporate predefined variables for empty cache into the one place
jimidle
committed

Commits on Mar 24, 2023

fix: Tiny correct to parent check for singleton context
jimidle
committed