Revert "update to Eclipse 2020-03 RCP base"

This reverts commit 077a6f8011.

com.minres.scviewer.database.vcd/META-INF/MANIFEST.MF

@@ -6,6 +6,7 @@ Bundle-Version: 2.0.2.qualifier
 Bundle-Vendor: MINRES Technologies GmbH
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Require-Bundle: com.minres.scviewer.database;bundle-version="1.0.0",
+ org.eclipse.equinox.util;bundle-version="1.0.500",
  org.eclipse.equinox.ds;bundle-version="1.4.200",
  org.eclipse.osgi.services;bundle-version="3.4.0",
  com.google.guava;bundle-version="15.0.0"