string 702: add  "enum lws_ssl_capable_status"

Introduce a LWS_WITH_WOL and an api to wake a mac address, optionally with
an address bind to the local interface to go out on.

Add a helper to parse ascii mac addresses well, and add tests.

warmcat#3004

Very very occasionally on server we try to add a NULL buffer to a buflist.

Let's try dealing with that by failing (caller must always be able to
handle failure from OOM) rather than asserting.

Addresses issue warmcat#2855 by allowing the parsing of the final byte when there are at least 3 bytes remaining in the buffer.

For every 4 bytes of input, a maximum of 3 bytes of output are generated when decoding the base64 string. The buffer space, therefore, only requires an additional 3 bytes of space. The code checks for space in the buffer before adding null termination.