QWERTY/AZERTY keyboard

[ivan-pi]

Currently I am using the raw key codes from Xlib, which are not portable between operating systems. Instead, we should rely on the (ASCII) characters and fixed keyboard layouts.

A few options:

• set the layout at build time, cmake .. -DKEYBOARD_LAYOUT=QWERTY
• set the layout at run time ./FC8 --qwerty (users can make an alias alias FC8=FC8 --azerty)
• auto-detect the specific layout dynamically

A few relevant links:

• https://tronche.com/gui/x/xlib/utilities/keyboard/
• https://tronche.com/gui/x/xlib/input/keyboard-encoding.html
• https://stackoverflow.com/questions/67561767/c-windows-how-to-correctly-detect-if-the-keyboard-layout-is-qwertz-or-azerty
• https://cboard.cprogramming.com/linux-programming/169388-detect-keyboard-layout-linux.html
• https://unix.stackexchange.com/questions/12072/how-do-i-get-current-keyboard-layout
• https://muhark.github.io/misc/linux/2021/04/07/custom-keymap-x11.html
• https://unix.stackexchange.com/questions/606301/how-can-one-create-a-custom-keyboard-layout-for-linux
• https://github.com/godotengine/godot/blob/2420e46b449f4c8acdfe48c765ea52fc3e860de7/core/os/os.h#L406 (also related to issue https://github.com/godotengine/godot/issues/5503)

[ivan-pi]

For now, keyboard configuration is performed at build time.