Store talk node type in scenario file as enumerator instead of numer

- Also, don't write empty CDATA sections when dialogue name/look/job sections are completely empty.

rsrc/schemas/dialogue.xsd

@@ -47,7 +47,7 @@
 		<xs:complexType>
 			<xs:sequence>
 				<xs:element name="keyword" minOccurs="1" maxOccurs="2" type="xs:string"/>
-				<xs:element name="type" type="xs:integer"/>
+				<xs:element name="type" type="xs:token"/>
 				<xs:element name="param" minOccurs="0" maxOccurs="4" type="xs:integer"/>
 				<xs:element name="text" minOccurs="1" maxOccurs="2" type="xs:string"/>
 			</xs:sequence>