New GEMOC project creates project with warnings

[dvojtise]

When doing a New GEMOC sequential xDSML project, the resulting project has some warning that could be easily avoided:

• Automatic-Module-Name' header is required for Java 9 compatibility
• The JRE container on the classpath is not a perfect match to the 'JavaSE-1.7' execution environment

[dvojtise]

see https://github.com/eclipse/gemoc-studio-modeldebugging/tree/master/java_execution/java_xdsml/plugins/org.eclipse.gemoc.execution.sequential.javaxdsml.ide.ui