Introduce CGUIColor type inheriting Color type and switch the GUI to exclusively use that.

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.

source/gui/GUIManager.cpp

@@ -19,8 +19,7 @@
 
 #include "GUIManager.h"
 
-#include "CGUI.h"
-
+#include "gui/CGUI.h"
 #include "lib/timer.h"
 #include "ps/Filesystem.h"
 #include "ps/CLogger.h"
@@ -347,7 +346,7 @@ InReaction CGUIManager::HandleEvent(const SDL_Event_* ev)
 }
 
 
-bool CGUIManager::GetPreDefinedColor(const CStr& name, CColor& output) const
+bool CGUIManager::GetPreDefinedColor(const CStr& name, CGUIColor& output) const
 {
 	return top()->GetPreDefinedColor(name, output);
 }