APL and BQN glyph support

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The APL language family requires specific unicode glyphs for programming in the language.

A full table can be found at these links:

• https://en.wikipedia.org/wiki/Miscellaneous_Technical
• http://www.math.uwaterloo.ca/~ljdickey/apl-rep/n1.html

https://mlochbaum.github.io/BQN/fonts.html is a BQN keymap.