Fixes for issues with multichar newline

[OMAlexB]

Contains fixes for the issues described in #2216, have verified this solves all our problems in our own testing.

Added support for filling the buffer with enough room to peek the next x characters to confirm it is the new line or delimiter instead of relying on just checking the first character. This fill behavior and peeking ahead will only be used if either the newline or delimiter is over two characters long.

[JoshClose]

I rewrote the parser from scratch and will be releasing it soon. It works completely different. I'll leave this hear until then though.