Handle implied access

In the case of service=emergency_access, it's implied that access=emergency, or at least vehicle=emergency.

I think the best way would be to add a new flag to replaced_tags.txt that only adds a tag if it doesn't already exist. Then we can do something like service=emergency_access : access=emergency | n

Should fix cases like https://github.com/organicmaps/organicmaps/issues/5983, where access is implied but not explicitly tagged

there are 26k ways worldwide tagged service=emergency_access, but without an access=* or vehicle=* so it'd be good to fix this. (to be fair, some of these may have gates with explicit access tagging)