* telnet: buffered output for async server

* telnet: make async buffer an option

* just use the queue containers directly

* try with simpler list

* exhaust buffers as much as possible in a single try

* don't forget to destroy the client object

* naming

* kill the connection earlier

* fix merge issues

* Added support for reverse telnet

* Fix issues with first command being ignored

* Fix incorrect client creation

* Integrate PR 1927

...2.6.0+ does this all by itself

hide _mqtt_client_secure under preprocessor check

Control board for Hoermann UAP1 Garage interface
http://frank-schuetz.de/index.php/fhem/13-hoermann-torantrieb-mit-espeasy-in-fhem-einbinden

* Get rid of _telnetFirst (assumption that first line is always telnet renegotiation)

Discussed in: #1920 (comment)

* light: fix inconsistent transitions

- capture step variable for the current transition
- use one-shot timer, restart from the timer callback

* schedule inside provider func, not transition

* web: re-add wifi scan action, send as json array

* ws: forcibly inline send functions

* Fix SSL check callback function definition

* Print secure client check as string

- use jquery slim, update to the latest 3.4.1
- update wheelcolorpicker to 3.0.8
- remove jquery ajax, call fetch for ws and xhr for upgrade
- tryng to be clever with colorpicker value conversions
- remove v from hsv colorpicker
- fix ir module using lightColor with 4 bytes, just use lightBrightness instead
- revert getFreeHeap overhead
- schedule lights provider on loop instead of running in sys
- fix crash with garp when AP is destroyed

* use indexed getsetting
* store defaults in progmem

- customize relay TOGGLE payload
- match payload string when receiving mqtt status message
- reference enum values instead of raw integers, spell out intended status
- remove dead code

amend #1885, capitalize `relayPayload...` suffix instead of using uppercase
add `relayPayloadToggle`