More read/write tests for town and outdoors, including maps/dialogue

Fixes:
- For towns, the "has tavern" flag was not saved or loaded
- Outdoor roads were not saved or loaded
- For outdoor encounters, the "can't flee" and "forced" flags were not loaded, and "forced" was not saved
--> These two flags have also been separated in the code

rsrc/schemas/town.xsd

@@ -95,6 +95,7 @@
 							<xs:element name="strong-barriers" minOccurs="0" type="bool"/>
 							<xs:element name="defy-mapping" minOccurs="0" type="bool"/>
 							<xs:element name="defy-scrying" minOccurs="0" type="bool"/>
+							<xs:element name="tavern" minOccurs="0" type="bool"/>
 						</xs:all>
 					</xs:complexType>
 				</xs:element>