Logical OR, AND, and NOT variants

[T0mstone]

Context

This proposal is based on typst/typst#4939. See the pull request description and discussion thread for additional context and concerns.

Proposal

Add the symbol variants from the following table under sym.

Character	Name
⩞ LOGICAL AND WITH DOUBLE OVERBAR (Binary)	eq.and
⩢ LOGICAL OR WITH DOUBLE OVERBAR (Binary)	eq.or
⫬ DOUBLE STROKE NOT SIGN (Relation)	not.double
⌐ REVERSED NOT SIGN (Normal)	not.rev
⫭ REVERSED DOUBLE STROKE NOT SIGN (Relation)	not.rev.double
⌙ TURNED NOT SIGN (Normal)	not.inv
⩠ LOGICAL AND WITH DOUBLE UNDERBAR	and.eq
⩙ LOGICAL OR OVERLAPPING LOGICAL AND (Relation)	and.or and or.and
⩘ SLOPING LARGE AND (Binary)	and.sloped (maybe and.slope)
⩚ LOGICAL AND WITH MIDDLE STEM (Binary)	and.stem
⩜ LOGICAL AND WITH HORIZONTAL DASH (Binary)	and.struck
⩕ TWO INTERSECTING LOGICAL AND (Binary)	and.twice
⨇ TWO LOGICAL AND OPERATOR (Large)	and.twice.big
⩣ LOGICAL OR WITH DOUBLE UNDERBAR (Binary)	or.eq
⩗ SLOPING LARGE OR (Binary)	or.sloped (maybe or.slope)
⩛ LOGICAL OR WITH MIDDLE STEM (Binary)	or.stem
⩝ LOGICAL OR WITH HORIZONTAL DASH (Binary)	or.struck
⩖ TWO INTERSECTING LOGICAL OR (Binary)	or.twice
⨈ TWO LOGICAL OR OPERATOR (Large)	or.twice.big