Adopt CSS of Xeokit tabs

- align inputs ans spans vertically
- adding disabled state for model

modules/bim/app/assets/stylesheets/bim/ifc_viewer/tabs.sass

@@ -105,9 +105,34 @@ $pill-padding-left: 8px
 
       input
         margin-right: 5px
+        vertical-align: middle
 
       span
         cursor: pointer
+        vertical-align: middle
+        &:hover
+          vertical-align: middle
         
   .xeokit-tree-panel > ul
     padding-left: 0
+
+.xeokit-modelsTab
+  .xeokit-form-check
+    padding: 2px 0 2px 15px
+    line-height: 3ex
+
+    input
+      vertical-align: middle
+
+    span
+      display: inline-block
+      @include varprop(color, main-menu-font-color)
+      padding-left: 3px
+      width: calc(100% - 16px)
+      vertical-align: middle
+
+      &:hover
+        cursor: pointer
+
+      &.disabled:hover
+        cursor: default