Matching the behavior of Go tooling, we are going to accept "\r\n" line
endings, but standaradize on "\n" being the official format.
Normalize line endings to "\n in the Parse function, so that we
never get stray "\r" characters in the source.
We shouldn't output any text during parsing, that's just strange!
token.ILLEGAL happens when the scanner has an error. This error is
recorded in `scerr` during parsing which is eventually returned out.
Therefore, we handle the error properly. We can simply return a backup
error here in case we don't (scanner errors are checked first).
The way that the contents of an object (objectList()) was parsed before
was weirdly implicit in expecting RBRACE as the ending token. This makes
that expectation explicit, which fixes a parse error that could occur
with an object that ends in an empty assign to an RBRACE.
Before this, the parser would accept this as expected behavior because
the object "ended" since the unexpected token was an RBRACE.
a.k.a lists of maps
Implementation was pretty straightforward - I had to tweak the `needsComma`
handling since it was stuck inside literal parsing. It happens out front
now. I also promoted the `assign_deep.hcl` parser test to a decoder
test that passes, since it was testing for an error to occur but now it
works! :)
Additionally we make ObjectLists support being comma-delimited, which
enables maps to defined inline like `{one = 1, two = 2}`.
Refs https://github.com/hashicorp/terraform/issues/7142
