[Frontend] Further cleanups to form elements

#700
#689
#740
Removed _selects.scss and moved classes
into _controls.scss;
Reorg'd _controls;
Moved classes into _elems.scss;
Added and fixed cssclass defs in multiple
bundle.js files to allow better field widths
in overlay dialogs;
Fixed overlay custom scrollbar colors;
Fixed alignment of required glyphs in forms;

platform/core/bundle.js

@@ -248,7 +248,7 @@ define([
                             "property": "name",
                             "pattern": "\\S+",
                             "required": true,
-                            "cssclass": "l-med"
+                            "cssclass": "l-input-lg"
                         }
                     ]
                 },