Filter enhancements

[jedmund]

Making a super issue for enhancements to the filter system:

• A lower effort way to see which filters are active on a given page (visible pills, a popover when hovering the icon, something)
• Your own profile should not be filtered at all
• Clear filters should reset all filters to 0 rather than our default. Maybe a reset to default button somewhere too?
• More filters for different battle settings and grid properties

This issue will supercede other lower-level filter-related issues such as #113 #280