Several small bugfixes

- Wrong image in generic lever dialog
- Crash in adventure notes dialog
- Incorrect spell costs shown on second page of spellcasting dialog
- Enable messages in "if context" node, but only for legacy scenarios
- Fix recorded dialogue not working
- Fix special items leaking between scenarios
- Fix training dialog
- Fix scenario editor sometimes crashing on scenarios that it wrote itself

rsrc/dialogs/basic-lever.xml

@@ -1,7 +1,7 @@
 <?xml version='1.0' encoding='UTF-8' standalone='no'?>
 <?xml-stylesheet href="dialog.xsl" type="text/xsl"?>
 <dialog defbtn='leave'>
-	<pict type='ter' num='13' top='9' left='8'/>
+	<pict type='dlog' num='9' top='9' left='8'/>
 	<button name='leave' type='regular' top='46' left='244'>Leave</button>
 	<button name='pull' type='regular' top='46' left='176'>Pull</button>
 	<text top='4' left='50' width='253' height='43'>There is a stout wooden lever protruding from the ground here. Pull it?</text>