When matching against custom window properties or atoms perform the
matching against all available values using logical OR if the special index
`[*]` is specified. If no index is specified, we fall-back to the first
value.
This should help when an atom has multiple values and you only want to
check against any of these — e.g. hiding windows with state `hidden`:
`--opacity-rule "0:_NET_WM_STATE@[*]:32a *= 'HIDDEN'"` — without having to
explicitly specify each index separately or when the index is not known
in advance.
Updated the manpage with examples for hidden and sticky windows.
5989477b9f