Includes:
* Moving them into an independent file
* Using named groups for clarity
* Support for multi-line list items
* Better handling of block markup at start / end of document (eg. hr)
* Better handling of the separation around block items (eg. space around a list)
Changes include:
* Much better encapsulation of textview/textbuffer, with each isolated
responsibility living independently on its own class/file.
* Less code overall
* Various small fixes around the components involved, such as:
* Indentation of nested lists (fixes#120)
* Unwanted scroll on select all (ctrl+a)
* Removal of unused code around the components involved
* Fixes for scrollbar location, now at the edge of the window