eis: add eis_client_has_capability
The EIS implementation needs to know if a client can use a given capability. No point setting up touch devices if the client isn't allowed those.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
The EIS implementation needs to know if a client can use a given capability. No point setting up touch devices if the client isn't allowed those.