Circlevis

* use default font instead of a monospaced font for events table

* calculate replay info statistics in the background. This usually reduces wait time when the replay info button is clicked
* replace an already displayed replay info panel for another instead of doing nothing if another replay info is selected
* cache replay info panels so they can be shown immediately if closed and reopened
* implement `__eq__` for `ReplayInfo`

* fix error when library is not passed to visualizer
* decrease edge hit threshold to 3 pixels (from 6)

* add settings which change how the visualizer draws gameplay. These can be accessed by clicking the new gear icon in the bottom right
* add a replay info panel, which appears to the left of gameplay if the "info" icon (an `i` in a circle) at the bottom right is clicked. You can jump to events in the replay from here (currently snaps and edge hits)
* decrease circle border size (from 8 pixels to 6)
* decrease gameplay padding (so gameplay is now larger for the same size window)
* display a 20% larger window when first opened
* use correct approach rate and circle size if any of the given replays have HR enabled

* update code for slider 0.3.0 breaking changes (this should have been done last release but forgot, oops)

* bump slider requirement to `~=0.3.0`