Two .dsl editors in the GEMOC Studio

There are currently 2 .dsl editors in the GEMOC Studio
one provided by GEMOC that also provides completion, highlighting, navigation and advanced checking (metaprog) (cf. https://github.com/eclipse/gemoc-studio-modeldebugging/blob/master/commons/plugins/org.eclipse.gemoc.dsl.ui/plugin.xml) and one provided by ALE (cf. https://github.com/gemoc/ale-lang/blob/master/plugins/org.eclipse.emf.ecoretools.ale.ide.ui/plugin.xml)

The one provided by ALE is basic as it simply opens the file as a java property file. This is fine if ALE is installed by itself without GEMOC but leads to ambiguity about which editor is the most efficient when used in the GEMOC Studio.

I suggest improving the name of both editors in order make sure which one is used

Compare the editor declarations in commons/plugins/org.eclipse.gemoc.dsl.ui/plugin.xml and plugins/org.eclipse.emf.ecoretools.ale.ide.ui/plugin.xml. Identify the two .dsl editor labels and update them so users can distinguish the GEMOC editor from the ALE editor, then verify both declarations remain valid.

Written by the indexing model from the issue text.