Fix the need for manually inserted polyfills

[ivard]

Besides the regular parsing by babel we need to manually include polyfills now. This is problematic, because people that do not use the webpack steps from irma-frontend will lack support for IE11. Therefore it might be better to include those polyfills directly in the code, or to properly document the need for those polyfills.

irma-frontend-packages/irma-frontend/webpack.config.js

Lines 6 to 13 in 0ddde99

	entry: {
	'irma': [
	'core-js/modules/es.promise',
	'core-js/modules/es.array.iterator',
	'core-js/modules/es.array.includes',
	'./index.js'
	],
	},