Change line endings in comments to line_end

[stasm]

The /.*/ regex doesn't match any of the line endings recognized by the JS RegExp engine, i.e. \n, \r, \u2028, \u2029. These are different from the line endings supported by the rest of the Fluent Syntax. This change unifies the line endings in all grammar productions.

[Pike]

We should do the same for comments and junk. Not sure if they should share a rest_of_line production, but they should implement the same solution for the problem.

Not opinionated on which of the two impls to use.

[stasm]

We should do the same for comments and junk. Not sure if they should share a rest_of_line production, but they should implement the same solution for the problem.

I think they are different and they shouldn't share the same solution. Line endings in Comments are normalized to LF. Line endings in Junk are unchanged, as per #184.