E4Tester with NatTable support and a better runner

This release provides the right code to use in maven Tycho and a set of methods to test nattables used in E4 application.

The p2 repository is available here : https://www.opcoach.com/repository/2019-12/

• Runner in Eclipse
  To run the tests within an Eclipse configuration, use a JUnit Plugin-Test and select the com.opcoach.e4tester.core.product in the main tab and select 'Run in UI Thread' in the first tab.

• Target Platform
  To add E4 Tester in your target platform (tpd editor), use these 3 lines :
  location "https://www.opcoach.com/repository/2019-12" {
  com.opcoach.e4tester.feature.feature.group
  }

• POM Configuration
  To run E4Tester from your POM File copy the following code in the test fragment pom file (also compliant for Mac OS ) :

<!-- For mac os, must use a specific configuration to manage the SWT Thread in UI Tests ! -->
	<profiles>
		<profile>
			<id>macosx</id>
			<activation>
				<os><name>mac os x</name><family>mac</family></os>
			</activation>
			<properties>
				<ui.test.vmargs>-XstartOnFirstThread</ui.test.vmargs>
			</properties>
		</profile>
		<profile>
			<id>other-os</id>
			<activation>
				<os><name>not-mac</name><family>!mac</family></os>
			</activation>
			<properties>
				<ui.test.vmargs></ui.test.vmargs>
			</properties>
		</profile>
	</profiles>

	<build>
		<plugins>
			<!-- Copy exactly this build block in each plugin test pom (in build/plugins) 
				or once in your parent pom if there are no other tests -->
			<plugin>
				<groupId>org.eclipse.tycho</groupId>
				<artifactId>tycho-surefire-plugin</artifactId>
				<version>${tycho-version}</version>
				<configuration>
					<!-- See https://www.eclipse.org/tycho/sitedocs/tycho-surefire-plugin/test-mojo.html -->
					<useUIHarness>true</useUIHarness>
					<useUIThread>false</useUIThread>
					<application>com.opcoach.e4tester.core.tychoRunnerApplication
					</application>
					<product>com.opcoach.e4tester.core.product</product>
					<argLine>${ui.test.vmargs}</argLine>
				</configuration>
			</plugin>
		</plugins>
	</build>