feat(@schematics/angular): evergreen new applications

By default, we now generate new applications which support only evergreen browsers, as a result differential loading is now opt-in.

A new flag `--legacy-browsers`, was added to generate applications which support non evergreen browsers such as Internet Explorer 11.

**Note**: After an application is generated opting in and out of differential loading is still possible through the supported browsers configuration in the browserslist configuration file  defaulted to `.browserslistrc`.

Author: alan-agius4

packages/angular_devkit/build_angular/src/utils/build-browser-features_spec.ts

@@ -25,7 +25,7 @@ describe('BuildBrowserFeatures', () => {
   afterEach(async () => host.restore().toPromise());
 
   describe('isDifferentialLoadingNeeded', () => {
-    it('should be true for for IE 9-11 and ES2015', () => {
+    it('should be true for IE 9-11 and ES2015', () => {
       host.writeMultipleFiles({
         '.browserslistrc': 'IE 9-11',
       });

packages/schematics/angular/application/files/.browserslistrc.template

@@ -2,11 +2,17 @@
 # For additional information regarding the format and rule options, please see:
 # https://github.com/browserslist/browserslist#queries
 
+# For the full list of supported browsers by the Angular framework, please see:
+# https://angular.io/guide/browser-support
+
 # You can see what browsers were selected by your queries by running:
 #   npx browserslist
 
-> 0.5%
-last 2 versions
-Firefox ESR
-not dead
-not IE 9-11 # For IE 9-11 support, remove 'not'.
+last 1 Chrome version
+last 1 Firefox version
+last 2 Edge major versions
+last 2 Safari major version
+last 2 iOS major versions
+Firefox ESR<% if (legacyBrowsers) { %>
+IE 9-11<% } else { %>
+not IE 9-11 # For IE 9-11 support, remove 'not'.<% } %>