int typecmp (PresenceType type_a, PresenceType type_b)
Compare two PresenceTypes.
`0` will be returned if the types are equal, a positive number will be returned if `type_a` is more available than `type_b`, and a negative number will be returned if the opposite is true.
| type_a | the first PresenceType to compare |
| type_b | the second PresenceType to compare |
| a number representing the similarity of the two types |
0.1.11