Fixes#1161
New .s-selectable, .s-hover, .s-selected and .s-moveable classes
New supporting color constants
Markup in layouts, fixed position/panels updated
Removed old commented code
open #1515
open #117
Markup changed to utilize mct-representation via CSS;
time-controller now uses list-based _constants values;
ConductorRepresenter.js modded to remove inline styling
and to add CSS classes to enclosing mct-representation;
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;
Repair the arguments given to the bottom resize
handle for frames in a layout; previously this had
been parameterized erroneously to function as a
right-hand resize handle. Part of transition of
layout elements, WTD-535.
