Started to redraw LOOT icon as SVG.

Following the Material Design guidelines as best I can.
More progress on SVG icon.

However, it looks rubbish when scaled down, so I'm going to try some
things for that.
Fixed icon looking rubbish when scaled down.

The yellow isn't a good edge material, it goes invisible against white
when the icons are too small to have noticeable shadows.
Generated ico file for new icon.
Revert "Moved filter tabs into a separate sidebar toolbar."

This reverts commit b5756c56b7ff9d655adc0c59a35038759729edd2.