This means the type information is available for all methods operating
with the setting type, which is easier for the authors, allows for
compile-time checks and optimizations.
Remove the enum that was used to indirectly obtain the setting type at
runtime.
Revises SGUISetting and enum from e326ebae46 (5122b0f906),
std::function from 82f1d2718b.
Differential Revision: https://code.wildfiregames.com/D2145
Tested on: gcc, clang, VS2015, Jenkins
This was SVN commit r22604.
The type differs from the Color type, because contrary to Color, it can
be created from a color predefined in the GUI page (such as "yellow").
Move this predefined color check to the new class instead of hardcoding
it in FromJSVal / ToJSVal, GUIUtil, JSInterface_IGUIObject and to
straighten the latter.
Delete fov_wedge_color from Minimap, unused since introduction in
5275dc862b.
This was SVN commit r22558.