Remove most behaviour disparities between blocks and mutes (#7231)

* Remove most behaviour disparities between blocks and mutes

The only differences between block and mute should be:

- Mutes can optionally NOT affect notifications
- Mutes should not be visible to the muted

Fix #7230
Fix #5713

* Do not allow boosting someone you blocked

Fix #7248

* Do not allow favouriting someone you blocked

* Fix nil error in StatusPolicy

app/policies/status_policy.rb

@@ -16,7 +16,11 @@ class StatusPolicy < ApplicationPolicy
   end
 
   def reblog?
-    !direct? && (!private? || owned?) && show?
+    !direct? && (!private? || owned?) && show? && !current_account&.blocking?(author)
+  end
+
+  def favourite?
+    show? && !current_account&.blocking?(author)
   end
 
   def destroy?