Refactor|Shadow Bias: Relocated and map-space shadow bias editor visuals
The in-map visualizers for various components of the shadow bias editor (including the cursor and source labels) were updated to use libdeng2 features and moved to rend_main.cpp
Refactor|Shadow Bias: Relocated and map-space shadow bias editor visuals
The in-map visualizers for various components of the shadow bias
editor (including the cursor and source labels) were updated to
use libdeng2 features and moved to rend_main.cpp
Also updated the GUI widgets.