Improve virtual folder structure (#1360).

Author: kbirken

code/languages/org.iets3.opensource/.mps/modules.xml

@@ -89,13 +89,13 @@
       <modulePath path="$PROJECT_DIR$/languages/org.iets3.req.core/org.iets3.req.core.mpl" folder="req" />
       <modulePath path="$PROJECT_DIR$/languages/org.iets3.req.plugin/org.iets3.req.plugin.msd" folder="req" />
       <modulePath path="$PROJECT_DIR$/languages/org.iets3.safety.attributes/org.iets3.safety.attributes.mpl" folder="safety" />
-      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.artifacts.base/org.iets3.variability.artifacts.base.mpl" folder="variability" />
-      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.artifacts.baseline/org.iets3.variability.artifacts.baseline.mpl" folder="variability" />
-      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.artifacts.typesystem/org.iets3.variability.artifacts.typesystem.mpl" folder="variability" />
-      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.artifacts.vanguard/org.iets3.variability.artifacts.vanguard.mpl" folder="variability" />
-      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.base/org.iets3.variability.base.mpl" folder="variability" />
-      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.configuration.base/org.iets3.variability.configuration.base.mpl" folder="variability" />
-      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.featuremodel.base/org.iets3.variability.featuremodel.base.mpl" folder="variability" />
+      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.artifacts.base/org.iets3.variability.artifacts.base.mpl" folder="variability.artifacts" />
+      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.artifacts.baseline/org.iets3.variability.artifacts.baseline.mpl" folder="variability.artifacts" />
+      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.artifacts.typesystem/org.iets3.variability.artifacts.typesystem.mpl" folder="variability.artifacts" />
+      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.artifacts.vanguard/org.iets3.variability.artifacts.vanguard.mpl" folder="variability.artifacts" />
+      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.base/org.iets3.variability.base.mpl" folder="variability.modeling" />
+      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.configuration.base/org.iets3.variability.configuration.base.mpl" folder="variability.modeling" />
+      <modulePath path="$PROJECT_DIR$/languages/org.iets3.variability.featuremodel.base/org.iets3.variability.featuremodel.base.mpl" folder="variability.modeling" />
       <modulePath path="$PROJECT_DIR$/languages/test.iest3.component.attribute/test.iest3.component.attribute.mpl" folder="comp" />
       <modulePath path="$PROJECT_DIR$/languages/test.org.iets3.analysis.base.solvable/test.org.iets3.analysis.base.solvable.mpl" folder="analysis.tests" />
       <modulePath path="$PROJECT_DIR$/languages/test.org.iets3.core.trace/test.org.iets3.core.trace.mpl" folder="trace" />
@@ -163,8 +163,8 @@
       <modulePath path="$PROJECT_DIR$/solutions/org.iets3.opensource.build/org.iets3.opensource.build.msd" folder="_build" />
       <modulePath path="$PROJECT_DIR$/solutions/org.iets3.opensource.interpreterExecutor/org.iets3.opensource.interpreterExecutor.msd" folder="_build" />
       <modulePath path="$PROJECT_DIR$/solutions/org.iets3.opensource.linters/org.iets3.opensource.linters.msd" folder="linters" />
-      <modulePath path="$PROJECT_DIR$/solutions/org.iets3.variability.artifacts.typesystem.runtime/org.iets3.variability.artifacts.typesystem.runtime.msd" folder="variability" />
-      <modulePath path="$PROJECT_DIR$/solutions/org.iets3.variability.base.ide/org.iets3.variability.base.ide.msd" folder="variability" />
+      <modulePath path="$PROJECT_DIR$/solutions/org.iets3.variability.artifacts.typesystem.runtime/org.iets3.variability.artifacts.typesystem.runtime.msd" folder="variability.artifacts" />
+      <modulePath path="$PROJECT_DIR$/solutions/org.iets3.variability.base.ide/org.iets3.variability.base.ide.msd" folder="variability.ide" />
       <modulePath path="$PROJECT_DIR$/solutions/org.iets3.variability.os.sandbox/org.iets3.variability.os.sandbox.msd" folder="variability" />
       <modulePath path="$PROJECT_DIR$/solutions/playground/playground.msd" folder="expr.tests" />
       <modulePath path="$PROJECT_DIR$/tests/test.components.functional/test.components.functional.msd" folder="comp.tests" />