YOLO Refactor: Version 1.0.0

[johnnyshields]

I've refactored the gem into core components:

• Tokenizer: Turns the old/new input strings into array of tokens to be diffed (similar to an LLM tokenizer). Special logic is added to treat the contents of HTML tags, URLs, and email addresses as single tokens.
• DiffBuilder: Does a diff of the old vs. new tokenized arrays.
• Formatter: Renders the output into HTML.

In the process, I realized that the DiffBuilder component is doing exactly what the very well-maintained diff-lcs gem already does much, much better, so I swapped out the guts for that gem. This magically fixed an issue where "foo bar baz" vs. "foo qux baz" would be grouped as ["foo", [" bar"/" qux"], " baz"] (leading whitespace in diff) rather than ["foo ", ["bar "/"qux "], "baz"] (trailing whitespace in diff), so yay for that!

Despite the size of this refactor, the core interface HTMLDiff.diff has not changed, and all previous specs pass + I added tons of new ones.

YOLO!!!