Add Feature: Card Settings/Show on card/Activities.

Fix: When in Card Settings hiding Comments, only adding new comment is hidden, not old comments.

Thanks to xet7 !

Closes #2925

models/boards.js

@@ -332,6 +332,14 @@ Boards.attachSchema(
       defaultValue: true,
     },
 
+    allowsActivities: {
+      /**
+       * Does the board allows comments?
+       */
+      type: Boolean,
+      defaultValue: true,
+    },
+
     allowsLabels: {
       /**
        * Does the board allows labels?
@@ -1119,6 +1127,10 @@ Boards.mutations({
     return { $set: { allowsComments } };
   },
 
+  setAllowsActivities(allowsActivities) {
+    return { $set: { allowsActivities } };
+  },
+
   setAllowsReceivedDate(allowsReceivedDate) {
     return { $set: { allowsReceivedDate } };
   },