Removed the label property from built-in behaviors, custom behaviors
defined in a few keymaps, and macros generated with ZMK_MACRO().
Now that node names are used to identify behaviors, and names only need
to be unique within the set of behaviors, the names of all behaviors
have been shortened to be similar to their original labels.
This means that any keymaps which reference behavior nodes by name
instead of by label will need to be updated. Keymaps typically use the
labels though, so most keymaps should be unaffected by this change.
Added ZMK_MACRO_DEFAULT_WAIT_MS and ZMK_MACRO_DEFAULT_TAP_MS to set
global defaults for the wait-ms and tap-ms properties of macros.
Also reduced the default timings for macros, since it's been reported
many times that 100 ms is too slow.