Fixing bug in the preprocessor when use "\r" as a newline character

[06wj]

Some shader files use "\r" as a newline character, an error will be reported when using it.

[AndrewRayCode]

Nice, thank you! And thanks for the test as well.

[AndrewRayCode]

There's probably some subtle bugs in the primary grammar too - I see

single_comment = $('//' [^\n]*)

and (for non preprocessed shaders)

preprocessor "prepocessor" = line:$('#' [^\n]*) _:_? { return node('preprocessor', { line, _ }); }