Add dialog allowing you to alter the scenario's graphics sheets from within the scenario editor

- You can copy/paste images into the sheet, or import/export to/from png files

Also:
- Picture controls in the dialog engine have a new "scaled" flag; if set, the picture will be scaled into the provided bounds rather than overflowing. Currently, only full sheets honour the setting.

src/dialogxml/dialog.cpp

@@ -105,6 +105,10 @@ template<> pair<string,cPict*> cDialog::parse(Element& who /*pict*/){
 			std::string val;
 			attr->GetValue(&val);
 			if(val == "true") custom = true;
+		}else if(name == "scaled"){
+			std::string val;
+			attr->GetValue(&val);
+			if(val == "true") p.second->setFormat(TXT_WRAP, false);
 		}else if(name == "size"){
 			std::string val;
 			attr->GetValue(&val);

src/dialogxml/pict.cpp

@@ -92,12 +92,14 @@ bool cPict::triggerClickHandler(cDialog& me, std::string id, eKeyMod mods){
 void cPict::setFormat(eFormat prop, short val) throw(xUnsupportedProp){
 	if(prop == TXT_FRAME) drawFramed = val;
 	else if(prop == TXT_FRAMESTYLE) frameStyle = val;
+	else if(prop == TXT_WRAP) drawScaled = !val;
 	else throw xUnsupportedProp(prop);
 }
 
 short cPict::getFormat(eFormat prop) throw(xUnsupportedProp){
 	if(prop == TXT_FRAME) return drawFramed;
 	else if(prop == TXT_FRAMESTYLE) return frameStyle;
+	else if(prop == TXT_WRAP) return !drawScaled;
 	else throw xUnsupportedProp(prop);
 }
 
@@ -828,8 +830,10 @@ void cPict::drawFullSheet(short num, rectangle to_rect){
 	rectangle from_rect;
 	std::shared_ptr<sf::Texture> from_gw = getSheet(SHEET_FULL, num);
 	from_rect = rectangle(*from_gw);
-	to_rect.right = to_rect.left + (from_rect.right - from_rect.left);
-	to_rect.bottom = to_rect.top + (from_rect.bottom - from_rect.top);
+	if(!drawScaled) {
+		to_rect.right = to_rect.left + (from_rect.right - from_rect.left);
+		to_rect.bottom = to_rect.top + (from_rect.bottom - from_rect.top);
+	}
 	rect_draw_some_item(*from_gw, from_rect, *inWindow, to_rect);
 }
 

src/dialogxml/pict.hpp

@@ -87,7 +87,7 @@ private:
 	static short animFrame;
 	pic_num_t picNum;
 	ePicType picType;
-	bool clickable, drawFramed;
+	bool clickable, drawFramed, drawScaled;
 	void drawPresetTer(short num, rectangle to_rect);
 	void drawPresetTerAnim(short num, rectangle to_rect);
 	void drawPresetMonstSm(short num, rectangle to_rect);