Added Runtime VM arguments to avoid errors

VisSketcher.launch

@@ -14,5 +14,5 @@
     <stringAttribute key="org.eclipse.jdt.launching.MODULE_NAME" value="structgraphics"/>
     <stringAttribute key="org.eclipse.jdt.launching.PROJECT_ATTR" value="structgraphics"/>
     <stringAttribute key="org.eclipse.jdt.launching.SOURCE_PATH_PROVIDER" value="org.eclipse.m2e.launchconfig.sourcepathProvider"/>
-    <stringAttribute key="org.eclipse.jdt.launching.VM_ARGUMENTS" value="--module-path ${project_classpath:structgraphics} --add-modules structgraphics,org.controlsfx.controls,javafx.controls,javafx.media,javafx.web,javafx.base,javafx.graphics --add-exports=javafx.controls/com.sun.javafx.scene.control.behavior=org.controlsfx.controls&#10;--add-exports=javafx.base/com.sun.javafx.event=org.controlsfx.controls&#10;--add-exports=structgraphics/fr.inria.structgraphics=javafx.graphics&#10;--add-opens=javafx.controls/javafx.scene.control.skin=org.controlsfx.controls&#10;--add-opens=javafx.graphics/javafx.scene=org.controlsfx.controls"/>
+    <stringAttribute key="org.eclipse.jdt.launching.VM_ARGUMENTS" value="--module-path ${project_classpath:structgraphics} --add-modules structgraphics,org.controlsfx.controls,javafx.controls,javafx.media,javafx.web,javafx.base,javafx.graphics --add-exports=javafx.controls/com.sun.javafx.scene.control.behavior=org.controlsfx.controls&#10;--add-exports=javafx.base/com.sun.javafx.event=org.controlsfx.controls&#10;--add-exports=javafx.base/com.sun.javafx.event=structgraphics&#10;--add-exports=structgraphics/fr.inria.structgraphics=javafx.graphics&#10;--add-exports=org.controlsfx.controls/impl.org.controlsfx.i18n=structgraphics&#10;--add-exports=org.controlsfx.controls/impl.org.controlsfx.spreadsheet=structgraphics&#10;--add-opens=javafx.controls/javafx.scene.control.skin=org.controlsfx.controls&#10;--add-opens=javafx.graphics/javafx.scene=org.controlsfx.controls"/>
 </launchConfiguration>