Add the following new Sandstorm features and fixes:

- All Boards page [so it's possible to go back from subtask board](https://github.com/wekan/wekan/issues/2082)
- Board favorites
- New Sandstorm board first user is Admin and [has IFTTT Rules](https://github.com/wekan/wekan/issues/2125)
  and Standalone Wekan Admin Panel. Probably some Admin Panel features do not work yet. Please keep backup of your grains before testig Admin Panel.
- Linked Cards and Linked Boards.
- Some not needed options like Logout etc have been hidden from top bar right menu.
- [Import board now works. "Board not found" is not problem anymore](https://github.com/wekan/wekan/issues/1430), because you can go to All Boards page to change to imported board.

and removes the following features:

- Remove Welcome Board from Standalone Wekan, [to fix Welcome board not translated](https://github.com/wekan/wekan/issues/1601).
  Sandstorm Wekan does not have Welcome Board.

Thanks to xet7 !

Closes #2125,
closes #2082,
closes #1430,
closes #1601,
related #2205,
related #2070,
related #1695,
related #1192.

client/components/settings/settingHeader.jade

@@ -4,22 +4,21 @@ template(name="settingHeaderBar")
 
   .setting-header-btns.left
     unless isMiniScreen
-      unless isSandstorm
-        if currentUser
-          a.setting-header-btn.settings(href="{{pathFor 'setting'}}")
-            i.fa(class="fa-cog")
-            span {{_ 'settings'}}
+      if currentUser
+        a.setting-header-btn.settings(href="{{pathFor 'setting'}}")
+          i.fa(class="fa-cog")
+          span {{_ 'settings'}}
 
-          a.setting-header-btn.people(href="{{pathFor 'people'}}")
-            i.fa(class="fa-users")
-            span {{_ 'people'}}
+        a.setting-header-btn.people(href="{{pathFor 'people'}}")
+          i.fa(class="fa-users")
+          span {{_ 'people'}}
 
-          a.setting-header-btn.informations(href="{{pathFor 'information'}}")
-            i.fa(class="fa-info-circle")
-            span {{_ 'info'}}
+        a.setting-header-btn.informations(href="{{pathFor 'information'}}")
+          i.fa(class="fa-info-circle")
+          span {{_ 'info'}}
 
-        else
-          a.setting-header-btn.js-log-in(
-            title="{{_ 'log-in'}}")
-            i.fa.fa-sign-in
-            span {{_ 'log-in'}}
+      else
+        a.setting-header-btn.js-log-in(
+          title="{{_ 'log-in'}}")
+          i.fa.fa-sign-in
+          span {{_ 'log-in'}}