[Cleanup] Use explicit conversions for enum formatting (#4064)

This is prep for updating to fmt 10 which removed implicit conversions
for enums.

common/bodytypes.h

@@ -64,4 +64,6 @@ typedef enum {
 } bodyType;
 /* bodytypes above 64 make the mob not show up */
 
+constexpr int format_as(bodyType type) { return static_cast<int>(type); }
+
 #endif