compat: get rid of BindIndicators

compat: get rid of BindIndicators

Now that 1fba6189e67 removed support for binding indicator maps by index
instead of name, we can remove some more magic which happens now: if an
indicator map specifies an indicator name which was not previously
declared in a 'indicator 5 = "Caps Lock"'-like statement in
xkb_keycodes, we can just look at the next free index and assign it.

This also allows us to use a darray for the LEDInfo's instead of a list.

Signed-off-by: Ran Benita <ran234@gmail.com>