Release v2.0.0-dev9

Changes in v2.0.0-dev9 (since v2.0.0-dev8):

Alex Schwantes (1):
      Implemented use of addFormSelector methods to _P004_Dallas plugin.     Changed the device select box to show the one wire address for each connected sensor instead of just a number.     Added a blank option to the device address select box so that in the event that multiple devices are present and the configured device is not currently available, the select box will be blank instead of selecting a different device.

Bartlomiej Zimon (5):
      - Misc: typo
      Custom Controller Settings - add controller index
      Push ProtocolIndex and ControllerIndex into CPLUGIN_WEBFORM_SAVE/LOAD
      Add WifiSSID2,WifiKey2 commands
      Add backup Wifi network to Settings command

Blair Thompson (1):
      Added Par4 and Par5 Variables (#248)

Daniel Tedenljung (5):
      Updated wrong plugin number. (#269)
      P052: More descriptive  log messages (#283)
      GUI touchup on Tools (#286)
      addSubmitButton function added (#289)
      New look on Tools page (#296)

DatuX (5):
      Update README.md
      Update issue_template.md
      Update CONTRIBUTING.md
      Update README.md
      Update README.md

Edwin Eefting (18):
      cleaned up messagedelay: use the same function everywhere. and do serial processing as well during the messagedelay
      fixed issue #253 (memory leaks/crashes)
      more details in memory analyser. run memory analyser via Travis
      cosmetic buildlog fix
      publish MQTT Connected message
      timer boundschecker was off by one. fixed memanalyser total
      input box fix on setting pages
      comments. checkudp only in backgroundtasks()
      reboot and wifidisconnect should be handled by /
      bugfix in rtc checksum
      nicer sleep messages
      fixed a few out of bounds bugs in Misc.ino _P023_OLED.ino _P035_IRTX.ino _P037_MQTTImport.ino with cppcheck. also added cppcheck to travis to prevent such cases in the future
      fixing cpp check
      fixing cpp check
      fixing cpp check
      fixing cpp check
      also distribute ESP8285 binaries
      automaticly updated release notes for v2.0.0-dev9

JK (5):
      added functions addCheckBox and addNumericBox
      added checkbox for status LED inversed
      fine tuning of status LED and pimp hardware web site
      solved my commit mismatch
      Fixed #196 and rework of IDX display

Jochen Krapf (11):
      Added addForm*-functions for easy web-interface and pimp GUI (#259)
      Added function addFormSelector (#270)
      Preliminary final draft of bugfix #264 (#271)
      Replaced HTML code with addFormSelector() in all plugins (#278)
      Fixed readUserVarFromRTC() #265 (#280)
      Limits to NumericBox and a bit of security to PasswordBox (#281)
      Added HTML templates for customization (#290)
      Fixed rules bug #297 (#299)
      Pimp device-GUI and optimized HTML (#306)
      Fixed some minor HTML syntax bugs (#310)
      Rework of plugin ADS1115 (#315)

PieVo (1):
      Plantower (#300)

beic (1):
      Some little description corrections (#297)

krikk (13):
      http advanced controller, correct passing of hostname (#250)
      i2c Temperatur & Humidity Sensor Am2320 (#251)
      use the new addCheckBox function and better display of device config page
      another fix to http advanced...
      replaced static html code with the new addForm* Functions
      bug fix wrong return type + form function fixes (#266)
      addFormNumeric with min and max & More Form-Function replacements (#272)
      make the Settings - Save. Filename more descriptive... (#273)
      addHelpButton Function and a new Help Button for the Rules and Hardware Page (#282)
      DHT plugin fix 'NaN' issue (#285)
      i don't like hidden features, added a json button to the tools menu, next to the advanced button (#292)
      do a dns lookup on every request, solves issue #261 (#302)
      AM2320: negative temperature fix... (#312)

tedenda (1):
      Moving plugin from Playground into main repo. (#262)