Choice rendering now uses "style.image()" instead of "style.choice_images[value]";

Added script functions for working with multiple choice values;
Added in_context support for filter_rule;
Optimized toUpper/toLower because they are slow on windows (they use thread local storage and mutexes)

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@427 0fc631ac-6414-0410-93d0-97cfa31319b6

src/data/field/choice.hpp

@@ -138,6 +138,7 @@ class ChoiceStyle : public Style {
 	ChoicePopupStyle            popup_style;        ///< Style of popups/menus
 	ChoiceRenderStyle           render_style;       ///< Style of rendering
 	Font                        font;               ///< Font for drawing text (when RENDER_TEXT)
+	ScriptableImage             image;				///< Image to draw (when RENDER_IMAGE)
 	map<String,ScriptableImage> choice_images;      ///< Images for the various choices (when RENDER_IMAGE)
 	bool                        choice_images_initialized;
 	Scriptable<String>          mask_filename;      ///< Filename of an additional mask over the images
@@ -150,6 +151,8 @@ class ChoiceStyle : public Style {
 	
 	/// Load the mask image, if it's not already done
 	void loadMask(Package& pkg);
+	/// Initialize image from choice_images
+	void initImage();
 	
 	virtual bool update(Context&);
 	virtual void initDependencies(Context&, const Dependency&) const;