fix(ngTouch): remove ngClick override, $touchProvider and $touch.

Closes angular#15761
Closes angular#15755

BREAKING CHANGE:

The `ngClick` directive from the ngTouch module has been removed, and with it the
corresponding `$touchProvider` and `$touch` service.

If you have included ngTouch v1.5.0 or higher in your application, and have not
changed the value of `$touchProvider.ngClickOverrideEnabled()`, or injected and used the `$touch`
service, then there are no migration steps for your code. Otherwise you must remove references to
the provider and service.

The `ngClick` override directive had been deprecated and by default disabled since v1.5.0,
because of buggy behavior in edge cases, and a general trend to avoid special touch based
overrides of click events. In modern browsers, it should not be necessary to use a touch override
library:

- Chrome, Firefox, Edge, and Safari remove the 300ms delay when
  `<meta name="viewport" content="width=device-width">` is set.
- Internet Explorer 10+, Edge, Safari, and Chrome remove the delay on elements that have the
  `touch-action` css property is set to `manipulation`.

You can find out more in these articles:
https://developers.google.com/web/updates/2013/12/300ms-tap-delay-gone-away
https://developer.apple.com/library/content/releasenotes/General/WhatsNewInSafari/Articles/Safari_9_1.html#//apple_ref/doc/uid/TP40014305-CH10-SW8
https://blogs.msdn.microsoft.com/ie/2015/02/24/pointer-events-w3c-recommendation-interoperable-touch-and-removing-the-dreaded-300ms-tap-delay/

Author: Narretz

src/ngTouch/touch.js

@@ -24,34 +24,6 @@ var ngTouch = angular.module('ngTouch', []);
 
 ngTouch.info({ angularVersion: '"NG_VERSION_FULL"' });
 
-ngTouch.provider('$touch', $TouchProvider);
-
 function nodeName_(element) {
   return angular.lowercase(element.nodeName || (element[0] && element[0].nodeName));
 }
-
-/**
- * @ngdoc provider
- * @name $touchProvider
- *
- * @description
- * The `$touchProvider` allows configuration of the ngTouch module. It currently contains
- * no methods.
- */
-$TouchProvider.$inject = [];
-function $TouchProvider() {
-
-  /**
-  * @ngdoc service
-  * @name $touch
-  * @kind object
-  *
-  * @description
-  * The `$touch` service currently has no contents.
-  */
-  // eslint-disable-next-line no-invalid-this
-  this.$get = function() {
-    return {};
-  };
-
-}