With the automagic size detection it is not necessary to painstakingly
calculate the number of menu items, the comopiler does it automagically.

Add all menu items in one list, and only exclude some with ifdef
depending on the firmware mode.

That alleviates the need to duplicate menu items that are used in both
modes, and clearly shows the difference between menu items in the two
modes.

execute_menu_function -> execute_menu_row_function
execute_meta_function -> execute_menu_function
meta mode -> menu mode
meta key -> menu key
fn key -> hyper key
circle -> circle_key

release version 2024-07-26

See merge request !70

Instead of having 3 identical lufa-master directories with 1459 files
using up 22 MB each, have one common lufa directory with 100 files using
up only 1.3 MB.

Minimized, by removing files from lufa one-by-one and checking whether
compiling the firmwares still yields bit-by-bit identical results. For
example:

find reform2-keyboard-fw/lufa-master/ -type f -print0 \
	| while IFS= read -r -d '' f; do
		git clean -fdx;
		rm "$f";
		ret=0;
		make -C reform2-keyboard-fw REFORM_KBD_OPTIONS="-DKBD_VARIANT_3 -DKBD_FW_VERSION=\\\"g3133711\\\"" || ret=$?;
		echo "69c70ae32b5376669120a2b1e70cebae  reform2-keyboard-fw/keyboard.hex" | md5sum --check - || ret=$?;
		if [ "$ret" != 0 ]; then
			git restore "$f";
		else
			git rm "$f";
		fi;
	done