* 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