Release mega-20190813

Changes in mega-20190813 (since mega-20190809):

ESPEasy release bot (1):
      automatically updated release notes for mega-20190813

Gijs Noorlander (21):
      [TTN] Add RN2483-Arduino-Library
      [TTN] Skeleton for C018 TTN RN2xx3 controller
      [RN2384 lib] Only use const String& in function parameters
      [LoRa plugin] Use separate object for C018 data
      [LoRa TTN] Create special interface for LoRa TTN controller
      [Controller page] Restructure Controller rendering page
      Missing break; statement in controllers function switch statement
      [Cleanup] Split Webserver.ino is separate files per page
      [Cleanup] Uncrustify of all WebServer_*.ino files
      [Cleanup] Split handle_controllers() function into separate functions
      [Cleanup] Split handle_devices() function into separate functions
      [Cleanup] Stop using global declared dummyString
      [LoRa TTN] Show Dev Addr in controller overview page as host
      [LoRa TTN] Send data to the TTN network + decoder
      [LoRa TTN] Start working on the interpreter of decoded data
      [Encoder] ICACHE_RAM_ATTR added for encoder plugin
      [LoRa TTN] Add basic decoder for all plugins
      [Docs] Building ESPeasy using PlatformIO in VS-Code
      [LoRa TTN] Add decoder types
      [LoRa TTN] Make settings configurable & add support ABP
      [LoRa TTN] Add documentation stubs for C018-LoRaTTN and C017-Zabbix

TD-er (2):
      Improve RN2xx3 LoRo TTN library
      [LoRa TTN] Add some statistics to the controller info page