HOOK_STEAL: add arg4 - quantity of items stolen

artifacts/scripting/hooks.yml

@@ -375,6 +375,7 @@
     Obj     arg1 - The target
     Item    arg2 - Item being stolen/planted
     int     arg3 - 0 when stealing, 1 when planting
+    int     arg4 - quantity of items being stolen
 
     int     ret0 - overrides hard-coded handler (1 - force success, 0 - force fail, -1 - use engine handler)
     ```

artifacts/scripting/hookscripts.md

@@ -478,6 +478,7 @@ Critter arg0 - Thief
 Obj     arg1 - The target
 Item    arg2 - Item being stolen/planted
 int     arg3 - 0 when stealing, 1 when planting
+int     arg4 - quantity of items being stolen
 
 int     ret0 - overrides hard-coded handler (1 - force success, 0 - force fail, -1 - use engine handler)
 ```

sfall/Modules/HookScripts/MiscHs.cpp

@@ -209,10 +209,11 @@ static void __declspec(naked) StealCheckHook() {
 		mov args[4], edx;  // target
 		mov args[8], ebx;  // item
 		mov args[12], ecx; // is planting
+		mov args[16], esi; // quantity
 		pushadc;
 	}
 
-	argCount = 4;
+	argCount = 5;
 	RunHookScript(HOOK_STEAL);
 
 	__asm {