Replace play2-maven-plugin by maven-dependency-plugin

[amanteaux]

Currently, the build is made in the pom.xml file using:

<plugin>
	<groupId>com.google.code.play2-maven-plugin</groupId>
	<artifactId>play2-maven-plugin</artifactId>
	<version>1.0.0-rc5</version>
	<executions>
		<execution>
			<goals>
				<goal>dist</goal>
			</goals>
			<phase>package</phase>
		</execution>
	</executions>
</plugin>

This could be replaced by:

<plugin>
	<groupId>org.apache.maven.plugins</groupId>
	<artifactId>maven-dependency-plugin</artifactId>
	<version>3.6.1</version>
	<executions>
		<execution>
			<id>copy-dependencies</id>
			<phase>package</phase>
			<goals>
				<goal>copy-dependencies</goal>
			</goals>
		</execution>
	</executions>
</plugin>

This needs to be tested further to make sure that this is the correct alternative.