Add drainliar, scatleton and skelion as pet disguises

Suggestions
1

Imported from legacy Flarum.
Original author: Vorpal (Flarum #234)

Description:
a) Enable trading scatleton and skelion eggs for disguises.
b) Add the familiar → drainliar evolution line, and enable that as a disguise.

Why is this a good idea?
More variety for spooky-themed character designs.

What risks or downsides does it have?
None.

Additional Info:
N/A

2

Imported from legacy Flarum.
Original author: crybabyhunter (Flarum #527)

Yes

3

Imported from legacy Flarum.
Original author: Muh (Flarum #1)

@Vorpal Maybe I’m missing something, but there is no Drainliar evolution officially, was it meant as custom addtion? Adding disguise is fine though

4

Imported from legacy Flarum.
Original author: Vorpal (Flarum #234)

@Muh yes custom; sorry, let me fix that:

b1) Add a custom familiar → drainliar evolution line, and enable drainliar as a regular pet disguise, or
b2) Add drainliar as an irregular pet disguise.