Added the strikethrough BBCode.
Redid the Round 4 Benchmark. The regular expression parser now works properly. The underline Regex was missing, thus it was finishing faster than it should have.
Restructured the plugin system.
Multiple plugins can bind to the same hook now (not available for variadic hooks yet!)
The parser is now benchmarked. The bench_round4 is run with both plugin_markdown and plugin_bbcode enabled.
Added a benchmark for the BBCode plugin.
Moved some of the template writing logic into a more generalised function.
URLs are now recognised by the system and linked.
Converted more custom errors into LocalError calls.
Faster and less bandwidth intensive Emojis on Edge.
Fixed a bug with replies not working.
