Make some progress decoding map trailer

internal/maps/maps.go

@@ -48,6 +48,25 @@ type Header struct {
 	// Need to investigate the rest of the header too
 }
 
+type Trailer struct {
+	Unknown1 uint16
+	Unknown2 uint16
+	Unknown3 uint32
+	Unknown4 uint32
+	Unknown5 uint32
+	NumCharacters uint32
+	Padding1 uint32
+	Unknown6 uint16
+	Unknown7 uint16
+	Unknown8 uint32
+	NumThingies uint32
+	Padding2 [36]byte
+}
+
+type Character struct {
+	Unknown1 uint32
+}
+
 func (h Header) Width() int {
 	return int(h.MaxWidth - h.MinWidth)
 }