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/scenedit/scen.keydlgs.h

@@ -10,7 +10,7 @@ enum eStrType {
 	STRT_PICT, STRT_SND, STRT_CMP, STRT_ACCUM, STRT_TRAP,
 	STRT_ATTITUDE, STRT_STAIR, STRT_LIGHT, STRT_CONTEXT,
 	STRT_SHOP, STRT_COST_ADJ, STRT_STAIR_MODE, STRT_TALK_NODE,
-	STRT_STATUS, STRT_SPELL_PAT,
+	STRT_STATUS, STRT_SPELL_PAT, STRT_SUMMON,
 };
 
 bool cre(short val,short min,short max,std::string text1,std::string text2,cDialog* parent) ;
@@ -33,3 +33,6 @@ void make_cursor_sword() ;
 void edit_dialog_text(short mode,short *str1,cDialog* parent);
 size_t num_strs(short str_mode);
 
+pic_num_t choose_damage_type(short cur, cDialog* parent);
+short choose_field_type(short cur, cDialog* parent, bool includeSpec);
+pic_num_t choose_status_effect(short cur, bool party, cDialog* parent);