Introduce two dialogs for debugging - a Set SDF dialog and a Debug Help dialog

- sd_legit() moved into cParty class

rsrc/dialogs/help-debug.xml

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+<?xml version='1.0' encoding='UTF-8' standalone='no'?>
+<?xml-stylesheet href="dialog.xsl" type="text/xsl"?>
+<dialog defbtn='okay'>
+	<pict type='dlog' num='16' top='8' left='8'/>
+	<text top='8' left='50' width='400' height='16'>DEBUG MODE HELP</text>
+	<text top='22' left='50' width='400' height='250'>
+		Debug mode is intended to aid you in testing your scenario.
+		While in debug mode, monsters don't move in combat and are killed in one hit.
+		In addition, you have access to a lot of additional hotkeys.<br/><br/>
+		Debug hot keys<br/>
+		  B - Leave town<br/>
+		  C - Get cleaned up (lose negative status effects)<br/>
+		  D - Toggle Debug mode<br/>
+		  E - Stealth, Detect Life, Firewalk<br/>
+		  F - Flight<br/>
+		  G - Toggle Ghost mode (letting you pass through walls)<br/>
+		  H - Heal<br/>
+		  K - Kill everything<br/>
+		  N - End Scenario<br/>
+		  O - Location<br/>
+		  Q - Magic map<br/>
+		  R - Return to Start<br/>
+		  S - Set stuff done flags<br/>
+		  T - Enter Town<br/>
+		  W - Refresh jobs/shops<br/>
+		  = - Heal, increase magic skills<br/>
+		  &lt; - Make one day pass<br/>
+		  &gt; - Reset towns (excludes the one you're in, if any)<br/>
+		  / - Bring up this list<br/>
+	</text>
+	<button name='okay' type='regular' top='280' left='387'>OK</button>
+</dialog>

rsrc/dialogs/set-sdf.xml

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+<?xml version='1.0' encoding='UTF-8' standalone='no'?>
+<?xml-stylesheet href="dialog.xsl" type="text/xsl"?>
+<dialog defbtn='okay'>
+	<pict type='dlog' num='7' top='8' left='8'/>
+	<text size='large' top='8' left='50' width='200' height='17'>Edit Stuff Done</text>
+	<text top='30' left='50' width='200' height='50'>
+		Here you can edit all the game data that lets the scenario know what you've done.
+		You can very easily mess up your game by doing this, so be sure you know what you're doing first.
+	</text>
+	<text top='105' left='8' width='100' height='16'>SDF Part A:</text>
+	<field name='x' top='103' left='110' width='80' height='16'/>
+	<text top='125' left='8' width='100' height='16'>SDF Part B:</text>
+	<field name='y' top='123' left='110' width='80' height='16'/>
+	<text top='145' left='8' width='100' height='16'>Value:</text>
+	<field name='val' top='143' left='110' width='80' height='16'/>
+	<text name='feedback' top='165' left='8' width='230' height='16'/>
+	<button name='exit' type='regular' top='185' left='187'>Exit</button>
+	<button name='set' type='regular' top='185' left='122'>Set</button>
+</dialog>