Release v2.0.0-dev8

Changes in v2.0.0-dev8 (since v2.0.0-dev7):

DatuX (6):
      Update README.md
      Update README.md
      Update README.md
      Update CONTRIBUTING.md
      Update CONTRIBUTING.md
      Update README.md

David Conran (2):
      Update IRremoteESP8266 library url in .gitmodules
      update sendSony() call to use repeats.

Dirk Moeller (2):
      new function, Plugin_004_DS_setResolution und Plugin_004_DS_getResolution
      fix typo

Edwin Eefting (37):
      temporary disabled IR plugins, because of iram1_0_seg issues
      initial version of memory analyser
      moved arduinojson and liquidcrytal includes to correct plugins. reanbled IR-modules to solve memory issues
      make the IRTX plugin work without the IR plugin
      initial memory analyser and results
      reduced memory usage _C001
      reduced mem C001 C002
      reduced ram usage C003 ... C011
      reduce memory usage N001 N002
      cleaned up servo stuff
      recuded number of pulsecounters from 8 to 4 to save IRAM
      contributing guidelines
      fixed crash in C001 (when opening /controllers)
      avoid static buffers in c001. addLog now also supports F(), so we dont need all those temporary variable definitions
      removed unneccesay delays from c001
      avoid unneccesary string conversions and static buffers in c001
      fixed crashes caused by large MQTT packets
      fixed lots of common issues that might cause crashes in c011. also see https://github.com/letscontrolit/ESPEasy/issues/117#issuecomment-293713370
      added issue template to get cleaner bug reports
      replaced all readstringuntil() with safeReadStringUntil()
      starting working on stability reporting function
      fixed stability issues in c009. probably caused by illegal PSTR usage, but i completly cleaned up all string handling
      improved statusled handling in background tasks
      converted submodule to normal directory. lib/Adafruit_Motor_Shield_V2 upstream commit ee4c4d334f498d54cdf80c9cc6f5bdec2533f8bf
      now no longer a submodule lib/AS_BH1750, upstream version 092f0b1c5fa74eb2abe3d1b2925190d066e9506d
      now no longer a submodule. lib/Adafruit_NeoPixel, upstream version v1.0.6
      now no longer a submodule, lib/Adafruit_TCS34725 upstream version 1.0.1-13-g12be4c6
      now no longer a submodule. lib/ArduinoJson upstream version v5.6.4
      now no longer a submodule. lib/IRremoteESP8266 upstream version v1.0.2
      oops moved lib/Adafruit_TCS34725 to wrong place
      select env
      Revert "Plugin_008-RFID extended with wiegand 34-bits and key-pad (4-bits per key) support". Now uses too much IRAM.
      dont use arduino OTA in the dev env
      escape html in the rules page, so that strings like &param do not cause problems. fixes issue #231
      properly escape html in C011 generic http advanced.
      fixed #239 due to improper PSTR. cleaned up string handling
      automaticly updated release notes for v2.0.0-dev8

Emmanuel Tatto (1):
      getBearing should be outside the FEATURE_ARDUINO_OTA condition (#207)

Gerben Meijer (1):
      Extend MH-Z19 sensor support

JK (3):
      More informative and intuitive status LED
      Using 3 I/O-pins consequently
      added union to TaskDevicePin1..3

Jochen Krapf (1):
      Added function isDeepSleepEnabled() (#177)

adb76 (2):
      Set BME280 to recommended values for climate / weather sensor
      BME280: Ensure sensor is in sleep mode to set the config, fix small typo

beic (13):
      Menu correction, added BMP180 (#199)
      Added detection for the HTU21D to I2C scenner
      Environment naming will better fit in...
      Environment naming will better fit in + HTU21D
      Environment naming will better fit in... + naming
      Environment naming will better fit in...
      Environment naming will better fit in...
      Environment naming will better fit in...
      Environment naming will better fit in...
      Environment naming will better fit in...
      Little naming correction
      Naming correction by Datasheet
      Added detection for the SI1145 to I2C scenner

dev0 (1):
      _C009.ino: RFC conformity and removed obsolet code (#163)

imthemichi (1):
      Plugin_008-RFID extended with wiegand 34-bits and key-pad (4-bits per key) support

jbaumann (1):
      Addition of ESP8285 targets (#187)

krikk (16):
      motorshield library should be a submodule, enhanced the motorshield plugin... (#162)
      http advanced: add replacement variable for systime, vcc, ip, sysload, uptime (#167)
      corrected name for TSL2561, add option to use different sensor adress (#170)
      re-did old pull requests (#172)
      Tsl2561 rewrite (#174)
      I2csoilmoisture fixed bug with sleep mode (#178)
      Pulsecounter minor fix (#184)
      rewrote bh1750 sensor based on better library... (#182)
      cppcheck style fixes... (#186)
      added i2c address selection to ino219 plugin (#192)
      Motorshield plugin string fixes (#200) (reduced memory usage)
      Support for Tcs34725 RGB Color Sensor (#195)
      _P047_i2c-soil-moisture-sensor: allow change of sensor address (#201)
      Httpadvanced crashfix + patch method (#204)
      Bh1750: enhance to check for valid value (#208)
      removed all unnecessary Strings due to new addLog with FlashStringHelper (#223)

tedenda (1):
      Update _P049_MHZ19.ino