fix/feat: Update Alexa integration and add Google Home support (#4980)

* Copied work done by mdomox

* Updates and fixes to CONTRIBUTING.md

* Spacing unification

* One more fix for CONTRIBUTING.md

* Minor code formatting improvements

* One more time...

* Renamed Alexa stuff to virtAsst for generic-ness

* Corrected missed translate() text

* Updated googlehome plugin to mimic the alexa plugin

* Changed order of operations

* Fixed parameter referencing in googlehome

* Yet another CONTRIBUTING fix

* Removed extra google stuff

* Migrated standalone intents to MetricNow intent

* Simplified route handling

* Added logging

* Added forgotten path selector

* Separated instructions for adding virtual assistant support in a plugin

* A few typo fixes

* Improved logging

* Updated Google Home plugin instructions

* Attempt to trigger download of template file

* Small wording tweaks

* Updated Alexa plugin documentation

* Updated test files

* Re-added handler count tests so devs are prompted to write tests for new handlers

* Updated Alexa documentation

* Small typo fix

* Clarification

* Further clarifications and typos

* Added language info to Google Home plugin doc

* URL correction

* URL fix v2

* Wording clarification

* Ugh...

* Minor instruction fix

* Sub steps fix

* Fixed Alexa references in Google Home

* Added a couple steps for improved user experience

* One more forgotten step

* Updated pump reservoir handler to handle undefined values

* Updated titles and unknown-value responses

* Modified forecast responses to use translate()

* Updated tests

* Improved training phrases

* Wording improvements

* Google Home setup instruction corrections

* Corrected how metric selection is found

README.md

@@ -99,6 +99,7 @@ Community maintained fork of the
         - [`override` (Override Mode)](#override-override-mode)
         - [`xdrip-js` (xDrip-js)](#xdrip-js-xdrip-js)
         - [`alexa` (Amazon Alexa)](#alexa-amazon-alexa)
+        - [`googlehome` (Google Home/DialogFLow)](#googlehome-google-homedialogflow)
         - [`speech` (Speech)](#speech-speech)
         - [`cors` (CORS)](#cors-cors)
       - [Extended Settings](#extended-settings)
@@ -518,6 +519,9 @@ For remote overrides, the following extended settings must be configured:
 ##### `alexa` (Amazon Alexa)
   Integration with Amazon Alexa, [detailed setup instructions](docs/plugins/alexa-plugin.md)
 
+##### `googlehome` (Google Home/DialogFLow)
+  Integration with Google Home (via DialogFlow), [detailed setup instructions](docs/plugins/googlehome-plugin.md)
+
 ##### `speech` (Speech)
   Speech synthesis plugin. When enabled, speaks out the blood glucose values, IOB and alarms. Note you have to set the LANGUAGE setting on the server to get all translated alarms.