remove more duplicate classes; add additional values functions; clean up tests

src/file/table/table-properties/table-overlap.ts

@@ -5,6 +5,16 @@ export enum OverlapType {
     OVERLAP = "overlap",
 }
 
+// <xsd:complexType name="CT_TblOverlap">
+//     <xsd:attribute name="val" type="ST_TblOverlap" use="required"/>
+// </xsd:complexType>
+//     <xsd:simpleType name="ST_TblOverlap">
+//         <xsd:restriction base="xsd:string">
+//             <xsd:enumeration value="never"/>
+//             <xsd:enumeration value="overlap"/>
+//         </xsd:restriction>
+//     </xsd:simpleType>
+
 class TableOverlapAttributes extends XmlAttributeComponent<{ readonly val: OverlapType }> {
     protected readonly xmlKeys = { val: "w:val" };
 }