While working on:

• Tilde encoding: use ~ instead of - for dash-encoding #1657
• Rethink how .ext formats (v.s. ?_format=) works before 1.0 #1439

It became very clear that the least maintainable part of Datasette at the moment is the way routing to the database, table and row views work - in particular the subclassing mechanism with BaseView and DataView, but also the complex variety of ways in which the URL routes capture different named regular expression groups.