More skinning/styling bug fixes.
SDK-19698 - Halo List with Gumbo skin is inconsistent with Gumbo FxList skin when setting baseColor style
SDK-19602 - focusColor is not supported by halo components
SDK-19595 - Various halo components do not look correct when in a disabled state.
QA/Doc Notes: The following changes are controlled by the compatibility-version flag:
old behavior: focus drawing was done with themeColor or errorColor, depending on the error state of the component
new behavior: focus drawing is done with focusColor or errorColor, depending on the error state of the component
* Disabled DateChooser drawing:
old behavior: border/bottom of header was same color regardless of enable setting
new behavior: when disabled, border/bottom of header are dimmed 50%
* ComboBase border:
old behavior: we always created a border object, but it was obscured by the other parts of the component
new behavior: don't create the border object