Implement editing dialogs for individual monster abilities

Changes to game:
- Permanent martyr's shield is now customizable - extra1 is per-mille chance to activate each time damage is taken, and extra2 is percent of damage taken to apply to attacker
- Absort spells is now customizable - extra1 is per-mille chance to activate each time damage is taken or a magic effect is applied, and extra2 is how much hp to gain from non-damaging magic effects
- Splits ability is now customizable - extra1 is per-mille chance of splitting each time damage is taken
- Special node ability is now called before the monster tries its normal attack, and multiple monsters can use them per round (though each can only use theirs once)
- Fix issue with breath weapons and icy touch abilities conflicting (legacy import issue)
- Add two variations of the summoning ability - summon according to summoning level (like the spells), or summon a random creature of a particular species
- Fix touch abilities using the range as chance to use

Changes to dialog engine:
- Fix tab order handling to exclude fields that are currently hidden
- Add method to retrieve the parameter passed to toast(), as a quick way to distinguish between the user clicking OK or Cancel after run() has exited
- Fix hidden fields being drawn anyway
- Fix setting stack page sometimes crashing if the current page was invalid due to earlier reducing the page count to 0

src/dialogxml/dialog.cpp

@@ -1016,8 +1016,13 @@ void cDialog::run(){
 	dialogNotToast = true;
 	// Focus the first text field, if there is one
 	if(!tabOrder.empty()) {
-		tabOrder[0].second->triggerFocusHandler(*this, tabOrder[0].first, false);
-		currentFocus = tabOrder[0].first;
+		auto iter = std::find_if(tabOrder.begin(), tabOrder.end(), [](std::pair<std::string,cTextField*> ctrl){
+			return ctrl.second->isVisible();
+		});
+		if(iter != tabOrder.end()) {
+			iter->second->triggerFocusHandler(*this, tabOrder[0].first, false);
+			currentFocus = iter->first;
+		}
 	}
 	// Sometimes it seems like the Cocoa menu handling clobbers the active rendering context.
 	// For whatever reason, delaying 100 milliseconds appears to fix this.
@@ -1197,7 +1202,7 @@ template<typename Iter> void cDialog::handleTabOrder(string& itemHit, Iter begin
 	while(iter != cur){
 		// If tab order is explicitly specified for all fields, gaps are possible
 		if(iter->second == nullptr) continue;
-		if(iter->second->getType() == CTRL_FIELD){
+		if(iter->second->getType() == CTRL_FIELD && iter->second->isVisible()){
 			if(iter->second->triggerFocusHandler(*this,iter->first,false)){
 				currentFocus = iter->first;
 			}
@@ -1235,6 +1240,7 @@ bool cDialog::toast(bool triggerFocus){
 		if(!this->getControl(currentFocus).triggerFocusHandler(*this, currentFocus, true)) return false;
 	}
 	dialogNotToast = false;
+	didAccept = triggerFocus;
 	return true;
 }
 
@@ -1242,6 +1248,10 @@ void cDialog::untoast() {
 	dialogNotToast = true;
 }
 
+bool cDialog::accepted() {
+	return didAccept;
+}
+
 bool cDialog::setFocus(cTextField* newFocus, bool force) {
 	// TODO: Should check that there IS a currently focused field (which might not be the case if there are no fields at all).
 	if(!force) {

src/dialogxml/dialog.hpp

@@ -150,6 +150,9 @@ public:
 	/// This is meant to be called from within an event handler to reverse a previous call to toast();
 	/// if you're already out of the dialog's event loop, you should instead call run() to reopen it.
 	void untoast();
+	/// Determine how the dialog exited.
+	/// @return the argument passed to toast() when the dialog was closed
+	bool accepted();
 	/// Get a reference to a control.
 	/// @param id The unique key of the control.
 	/// @throw std::invalid_argument if the control does not exist.
@@ -190,7 +193,7 @@ private:
 	void draw();
 	std::string process_keystroke(cKey keyHit);
 	std::string process_click(location where);
-	bool dialogNotToast;
+	bool dialogNotToast, didAccept;
 	rectangle winRect;
 	std::string defaultButton;
 	boost::any result;

src/dialogxml/field.cpp

@@ -175,6 +175,7 @@ cTextField::cTextField(cDialog* parent) :
 cTextField::~cTextField(){}
 
 void cTextField::draw(){
+	if(!visible) return;
 	static const sf::Color hiliteClr = {127,127,127}, ipClr = {92, 92, 92};
 	inWindow->setActive();
 	rectangle outline = frame;

src/dialogxml/stack.cpp

@@ -98,6 +98,7 @@ size_t cStack::getPage() {
 void cStack::setPageCount(size_t n) {
 	if(curPage >= n && n > 0)
 		setPage(nPages - 1);
+	if(n == 0) curPage = 0;
 	nPages = n;
 	storage.resize(nPages);
 }