How to pass multi CLI arguments to antlr?

[ArcticLampyrid]

Like #69
options.additionalParameters only supports to pass a single argument currently.

---

A detailed example:

{
    "antlr4.generation": {
        "additionalParameters": "-encoding UTF8"
    }
}

will pass "-encoding UTF8" instead of "-encoding" "UTF8"

[JohnLouderback]

I'm experiencing the same issue. The encoding is being interpreted incorrectly, but I don't seem to have any way to pass it in.

[ArcticLampyrid]

For encoding problems, since VSCode did't yet provide encoding-related APIs (microsoft/vscode#156039), it's impossible to handle it perfectly.
But I recommend to use UTF-8 by default in CLI arguments, as many parts of this extension have assumed that the encoding is UTF-8 when analyzing the grammar files.