It is wrong because the predefined colors should be loaded from the GUI
page that requests to have the color parsed, which may be different from
the topmost page.
Similar to FindObjectByName removed in f9b529f2fb.
Achieve this by implementing the CGUISetting<CGUIColor>::FromJSVal
specialization, moved from ScriptInterface::FromJSVal<CGUIColor>,
instead of adding a CGUI pointer to CGUIColor.
Mark ScriptInterface::FromJSVal<GUIColor> and inherited
CColor::ParseString explicitly as deleted, so that people get a compile
error if they forget to check for predefined colors when parsing a
color.
Refs #5387, D1746 > D1684 > this > f9b529f2fb, 9be8a560a9, 415939b59b,
2c47fbd66a, 85a622b13a.
Differential Revision: https://code.wildfiregames.com/D2108
Tested on: clang 8, VS2015
This was SVN commit r22663.