Button to show all reviews in the sidebar for all points currently visible in the map's view

Similar to clicking on one spot, but:

All reviews are shown in the sidebar for all spots currently visible
Off-screen spots don't count
Filters applied to the map apply to the sidebar as well
Panning and zooming change the contents of the sidebar
Sort by recent by default (we can add an dropdown to change this later) -- this can replace recent.html, which I use for moderation
Every review has a link to the spot it's reviewing
Show first 500 reviews, we can add pagination later

bopjesvla / hitch