* Telnet rewrite, no longer using ESPAsyncTCP

* Support two telnet server implementations

* Clean up diff

* Update types, no free() calls, cleanup

* Use std::unique_ptr

* Fix nullptr checks

* Fix double log with async server

* Common new connection method

* use same connected() check as sync variant

* fixup! use same connected() check as sync variant

* Fix compile issue, close connection in case of timeout and when max connections reached

* Use AyncsClient* in function call

* Allow overriding telnet port + max clients

* Do not allocate 512 bytes by default

* Use TERMINAL_BUFFER_SIZE

* Simply print timestamp for supported destinations
* Update ws destination to support 'prefix' sub-key
* Avoid void casting in telnet module

* Telnet auth depends on setting

* use same define suffix as WS_

* add to web

* no initial passwd for core