#1268 added regression test for opening and closing projects

And for modifying the configuration files while the project is closed
Not yet all data is stored in the file so some will still be in the
environment vars stored by CDT but and these are currently unhandles
making the cross close persistency test fail

Author: jantje

io.sloeber.tests/META-INF/MANIFEST.MF

@@ -12,10 +12,12 @@ Require-Bundle: io.sloeber.core,
  org.junit;bundle-version="4.12.0",
  org.apache.commons.lang,
  io.sloeber.ui,
- org.eclipse.swt
+ org.eclipse.swt,
+ org.eclipse.cdt.managedbuilder.core;bundle-version="9.0.0"
 Bundle-ActivationPolicy: lazy
 Import-Package: io.sloeber.ui,
- io.sloeber.ui.monitor
+ io.sloeber.ui.monitor,
+ org.apache.commons.io;version="2.6.0"
 Automatic-Module-Name: io.sloeber.tests
 Export-Package: io.sloeber.core;x-internal:=true,
  io.sloeber.junit;x-internal:=true,