Implement loading of scenarios

- This also tweaks the scenario schemas for consistency between schemas and code, adds some unique key restraints, and makes some attributes required.

rsrc/schemas/dialogue.xsd

@@ -52,10 +52,7 @@
 				<xs:element name="text" minOccurs="1" maxOccurs="2" type="xs:string"/>
 			</xs:sequence>
 			<xs:attribute name="for" type="xs:integer" use="required"/>
-		</xs:complexType><!--
-		short personality,type;
-		char link1[4],link2[4];
-		short extras[4]; -->
+		</xs:complexType>
 	</xs:element>
 	<xs:element name="dialogue">
 		<xs:complexType>
@@ -63,7 +60,7 @@
 				<xs:element ref="personality" maxOccurs="10"/>
 				<xs:element ref="node" minOccurs="0" maxOccurs="unbounded"/>
 			</xs:sequence>
-			<xs:attribute name="boes" type="xs:string"/>
+			<xs:attribute name="boes" type="xs:string" use="required"/>
 		</xs:complexType>
 	</xs:element>
 </xs:schema>