Add UI for filtering on class level

[Famlam]

Spin-off from the discussion in osm-fr/osmose-backend#1595

On the front-end, a user cannot easily disable warnings related to a single class. Checkboxes only exist on an item level. (And I guess 99% of the users will only use the main UI)
Hence, if you disable e.g. Inconsistent tagging of construction (item 4070, class 40701) you immediately disable Finished construction and so on.

Proposal:
allow filtering the active analysers by making the checkboxes expandable to i.e. class level. So instead of e.g.:

[v] addresses
[v] combinations
[v] deprecated

... have user-expandable lists, like:

[v] ▷addresses
[v] ▼combinations
  [v] missing tag
  [v] suspicious tag combination
  [v]  {{0.key}} on a relation without {{1.key}}={{1.value}}
  [v]  incomplete usage of {{0.key}} on a way without {{1.key}}
  [v]  Use transition only as value of placement
[v] ▷deprecated

And preferably the 'Hide from map' button will only disable the specific class, not the entire item. Currently it shows Do not want to see [class title] markers? [Hide from map], but clicking it disables the entire item