Move to generic text formatting system

[zachbr]

The current system for translating text formatting from discord and IRC involves a mutator in the middle of the system. This is not ideal because it can make it difficult for future systems to identify the formatting in use as depending on when it is accessed it may be in either Discord markdown or IRC escape codes.

This should also allow us to more intuitively handle sending multiple messages where the formatting needs to be split as well.

Such a system or library need only support basic text formats, (ex: bold, italics, underline, strikethrough) or the ability to add them.