https://gitlab.synchro.net/main/sbbs/-/commit/a638eee661a618e0ecf33ded
Modified Files:
	src/conio/x_cio.c x_events.c x_events.h
Log Message:
In X11 mode, support arbitrary character entry.

You still cannot enter a NUL.

Holding down ALT and entering an 8-bit decimal number on the keypad
starting with a digit from 1-9 will pass that byte to the input
buffer as entered.

If you prefix the decimal number with the keypad zero, you can enter
a Unicode codepoint to be translated and sent (if it translates).
--- SBBSecho 3.23-Linux