Keyword/phrase filtering (#7905)

* Add keyword filtering

    GET|POST       /api/v1/filters
    GET|PUT|DELETE /api/v1/filters/:id

- Irreversible filters can drop toots from home or notifications
- Other filters can hide toots through the client app
- Filters use a phrase valid in particular contexts, expiration

* Make sure expired filters don't get applied client-side

* Add missing API methods

* Remove "regex filter" from column settings

* Add tests

* Add test for FeedManager

* Add CustomFilter test

* Add UI for managing filters

* Add streaming API event to allow syncing filters

* Fix tests

1 files changed, 5 insertions, 0 deletions

diff --git a/spec/models/custom_filter_spec.rb b/spec/models/custom_filter_spec.rb
new file mode 100644
index 000000000..1024542e7
--- /dev/null
+++ b/spec/models/custom_filter_spec.rb
@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe CustomFilter, type: :model do
+
+end