Change antigen to a submodule

Joel Grunbaum

2021-12-22 4cfc7cf858d875d3febeefa8a978a6f715442f07

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extra-keys = [ \
 ['ESC','|','/','HOME','UP','END','-','DEL'], \
 ['TAB','CTRL','ALT','LEFT','DOWN','RIGHT','_','BKSP'] \
]