grammars-v4
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Fix for issue #2749 -- "go get" connection link errors
- Changes to _scripts/regtest.sh so we don't uninstall/reinstall Trash tools. It's wasted bandwidth.
- Add a loop around "go get" to repeat 5 times or fail.
- In response to https://github.com/antlr/grammars-v4/pull/2731 build issues.