Spoon symbols

[T0mstone]

Context

Unicode defines multiple spoon-like symbols. ⊸ is already multimap

Proposal

Add the symbols from the following table under sym.

Character	Name(s)
⫯ VERTICAL LINE WITH CIRCLE ABOVE	spoon, spoon.t
⫰ VERTICAL LINE WITH CIRCLE BELOW	spoon.b
⟟ UP TACK WITH CIRCLE ABOVE	spoon.t.bar
⫱ DOWN TACK WITH CIRCLE BELOW	spoon.b.bar
⟜ LEFT MULTIMAP	spoon.l
⊸ MULTIMAP	spoon.r

Note that all those characters have the math class Relation, except for ⫱, which has the math class Normal.

Additionally, ⟜ could be added as multimap.rev as well.