* test: restore webui builds in travis

* show build.sh usage via -h, exclude build stage instead of explicitly including it

Test: add an ability to run only one build configuration + fix related gcc warnings

https://github.com/xoseperez/espurna/issues/1465

* utils/version: use git description token as version, add memoization

* pio: move extra scripts to a separate directory

* pio: add -DAPP_REVISION=... as local build flag

Lights: configure mired warm / cold at runtime

* terminal: avoid softlock when comparing signed with unsigned

* move offset increment to condition

* adjust settings and crash handler available space

* key

* offset embedis writer and reader too

* rollback settings change

* travis: move build flags tests outside of hardware header

* mqtt: fix typo

* travis: use files instead of bundling test cases into script

* fixup! travis: use files instead of bundling test cases into script

* fix variable expansion, remove custom h at the end

* add ade7953 to sensors list

* custom.h path as variable

* shellcheck

* fix printf syntax, silent again

* fix bash 4.3 treating empty array as unset variable

* 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