* provide full version descriptor, displayed in debug mode
* unix: shows core version like under windows when git is unavailable
* store strings in progmem
* version string honours NDEBUG
* add ARDUINO_ESP8266_GIT_DESC
restore ARDUINO_ESP8266_GIT_VER
restore global variable "core_version"
don't print full version on setDebugOutput(true)
set platform.txt version to 2.4.1-pre
hide irrelevant boot version
fix typo
* lwip2: fix disconnection/reconnection issue
also:
improve version string
remove useless message
* lwip2: bump tag before 2.4.1
* lwip2: improve netif flags management on git side
* full-version string: remove useless NDEBUG in separate source file
* do not automatically enable sdk messages along with core messages
* automatically reenable sdk messages along with core messages *before* setup not after
* check serial port when showing version-string + move sdk messages enabler in hardware serial
* + license header
* updated and tested windows commands in platform.txt (without git)
* updated and tested windows commands in platform.txt (without git)
* update package builder accordingly
