Match GWE number of viewable properties

[derenv]

Now that we largely can replicate the functionality of the extension, the next goal is to try and get enough properties displayed (in a good way) to match GWE.

Rather than having everything on one page, we want to split this up into a bunch of easily-switchable pages (see #33). This allows better information density while matching functionality.

Will need to get fan-curve tweaking support working for this to be complete (see #36)