Obsolete Package, use antlr4 directly to generate typescript targets

[1R053]

This package is obsolete and will not work with most recent typescript versions, e.g. due to error TS2611.

Instead, use ANTLR4 directly.

1. Install as described here:
   https://github.com/antlr/antlr4/blob/master/doc/getting-started.md

2. generate the typescript files as described here:
   https://github.com/antlr/antlr4/blob/master/doc/typescript-target.md

[mike-lischke]

ANTLR4 has no real TypeScript runtime (only the code generator is using TS). The runtime is still JavaScript with some type definitions.

For a full TypeScript runtime I recommend antlr4ng, which I created.