SSL support and access controls

[easytarget]

The ESP32 is capable of secure (SSL) http communications; so enable it.
Lots of issues getting working certificates and keys, both generating them, and encoding them into the sketch. But a good example with documentation would be a good start,

• This is another quite well known ESP32 thing to do; so I can probably leverage solutions from other projects, or at least get a good hint.

Adding a HTTP basic auth system makes sense as part of this; #80 has a good example.