Convert the last two core scenario dialogs

- Edit special encounter dialog now expects a parent and returns false if the user cancelled.

rsrc/dialogs/set-start-loc.xml

@@ -0,0 +1,24 @@
+<?xml version='1.0' encoding='UTF-8' standalone='no'?>
+<?xml-stylesheet href="dialog.xsl" type="text/xsl"?>
+<dialog skin='light' defbtn='okay' debug='true'>
+	<!-- OK button -->
+	<field name='town-num' top='77' left='181' width='43' height='16'/>
+	<field name='town-x' top='104' left='181' width='43' height='16'/>
+	<field name='town-y' top='104' left='280' width='43' height='16'/>
+	<button name='okay' type='regular' top='185' left='359'>OK</button>
+	<pict type='dlog' num='16' top='8' left='8'/>
+	<text top='25' left='50' width='371' height='41'>
+		Enter the town the party will start the scenario in.
+		Also enter the x-y location in the town to place the party at.
+		Don’t forget to place that town somewhere in your scenario.
+	</text>
+	<text size='large' top='6' left='50' width='256' height='17'>Starting Location</text>
+	<text top='105' left='50' width='120' height='14'>Start location:  X =</text>
+	<text top='105' left='232' width='39' height='14'>Y =</text>
+	<button name='cancel' type='regular' top='185' left='293'>Cancel</button>
+	<text top='129' left='51' width='372' height='55'>
+		NOTE: You also need to set the starting location outdoors.
+		This is where the party ends up when they leave town for the first time.
+		To set this, use the Set Starting Location option in the outdoors menu.
+	</text>
+</dialog>