WTD-951
layout.html:
Added classes to and removed inline styles from drag handles,
Removed edge handles, leaving corner handles in NW, SW and SE only;
Added hover classes to display corner handles while editing;
Modified z-indexing to allow view switcher to be accessed while editing;
WTD-839
.t-view-switcher > .view-switcher;
Added CSS transition to hide/show of view-switcher;
Moved .view-switcher hide/show to _frame.scss;
Tweaked .frame:hover to raise z-index to show complete border;
WTD-1163
WTD-1146
New CSS to hide non-functional elements, including browse.top-bar with search elements;
Adjusted spacing, mainly in .contents CSS class;
