3.0 dev grid filter logic

[katherineyli]

Resolves #458

[luisvasq]

Looking good, @katherineyli! Here are a few items related to functionality and potential improvements:

• Can you enable filters in non-map charts by adding a default root group? Also, we'll need to make sure that the number of active filters shown in the badge remains consistent.
• Can you make the "Logic" cells selectables between AND and OR?
• Let's make AND the default logic for the root group and any newly created group.
• This one is trickier but should be feasible: I'm thinking of bringing back the idea of collapsing/expanding logic groups, although I'm not sure if it will look good in the UI. I know @connor-makowski wanted to remove this functionality. For visual purposes, can you add some arrow icon buttons inside an unnamed actions column between the "Logic" and "Statistic"|"Source" columns? If it looks good, we can discuss the convenience of having this functionality.
• There might be a bug in the filter logic as the node icons are not displayed on the map. This is how it looks on my end:

[connor-makowski]

Looks like another merge stomped on a few files. Should be an easy conflict resolution. Then feel free to merge in. Nice job @katherineyli