Bump Version to Angular 13, code quality of life improvements

[gcko]

As part of the switch to Angular 13, I did the following as well:

• Removed tslint and added in eslint in it's place. TSlint is deprecated and removed from Angular.
• Removed unused scss files in Demo
• Fixed linting throughout the codebase to conform to the latest practices in place by Angular
• Removed unused e2e code
• Fixed all migration requirements from Angular 11 to Angular 13
• Bumped Angular Material to 13 as well
• Typed everything in daterangepicker.component.ts and daterangepicker.directive.ts
• Bumped ng-packagr to the latest and ensured the build continued to work
• Added ng-package.json to conform to ng-packagr's latest requirements
• Fixed the imports
• bumped the target to es2020
• removed protractor (not in use)

[fetrarij]

Hello @gcko thanks for your PR. Your PR is very interesting