Use upstream's settings for CW auto-expand and column swiping (#1770)

* Use Mastodon server-side settings for automatically expanding toots with CWs

* Add modal warning about settings changes

* Use Mastodon server-side settings for disabling swiping

app/javascript/flavours/glitch/reducers/local_settings.js

@@ -3,13 +3,12 @@ import { Map as ImmutableMap } from 'immutable';
 
 //  Our imports.
 import { STORE_HYDRATE } from 'flavours/glitch/actions/store';
-import { LOCAL_SETTING_CHANGE } from 'flavours/glitch/actions/local_settings';
+import { LOCAL_SETTING_CHANGE, LOCAL_SETTING_DELETE } from 'flavours/glitch/actions/local_settings';
 
 const initialState = ImmutableMap({
   layout    : 'auto',
   stretch   : true,
   navbar_under : false,
-  swipe_to_change_columns: true,
   side_arm  : 'none',
   side_arm_reply_mode : 'keep',
   show_reply_count : false,
@@ -26,7 +25,6 @@ const initialState = ImmutableMap({
   tag_misleading_links: true,
   rewrite_mentions: 'no',
   content_warnings : ImmutableMap({
-    auto_unfold : false,
     filter      : null,
   }),
   collapsed : ImmutableMap({
@@ -66,6 +64,8 @@ export default function localSettings(state = initialState, action) {
     return hydrate(state, action.state.get('local_settings'));
   case LOCAL_SETTING_CHANGE:
     return state.setIn(action.key, action.value);
+  case LOCAL_SETTING_DELETE:
+    return state.deleteIn(action.key);
   default:
     return state;
   }