[Mobile] IN PROGRESS: Styling in forms, overlay and tree

open #74
.section-header and form-row styles changed in forms/_elems.scss;
significant changes to overlay in mobile: full-screen, close button, more;
tree hover bg changed to use rgba(#fff, 0.1);
removed "Hide title by default" in core/bundle.json;

platform/commonUI/general/res/sass/mobile/overlay/_overlay.scss

@@ -1,6 +1,10 @@
 @include phoneandtablet {
     .overlay {
         $m: 0;
+        .clk-icon.close {
+            top: $mobileOverlayMargin; right: $mobileOverlayMargin;
+        }
+
         > .holder {
             @include border-radius($m);
             top: $m;
@@ -13,6 +17,12 @@
                 bottom: $mobileOverlayMargin;
                 left: $mobileOverlayMargin;
 
+                .top-bar {
+                    > .title {
+                        margin-right: 1.2em;
+                    }
+                }
+
                 .form.editor {
                     border: none;