Sample application archetypes should use precompiled com.vaadin.DefaultWidgetset

Originally by zigac

Change value of @Widgetset in MyUI.java:

@Widgetset("com.vaadin.DefaultWidgetSet")
public class MyUI extends UI

and add dependency to pom.xml:

<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-client-compiled</artifactId>
</dependency>

Usually when creating new demo/sample Vaadin project, you want to use just core Vaadin components.

As well as newcomers came testing Vaadin, want to start with development and testing immediately without need of running complicated and longlasting maven tasks to compile widgetset.

Imported from https://dev.vaadin.com/ issue #19399

vaadin / archetypes

Sample application archetypes should use precompiled com.vaadin.DefaultWidgetset #93

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