Add test to run all junit tests

There are plugin unit tests suites but there was not jet a realJUnit
test suite

Author: jantje

io.sloeber.tests/src/io/sloeber/junit/AllJUnitTests.java

@@ -0,0 +1,12 @@
+package io.sloeber.junit;
+
+import org.junit.runner.RunWith;
+import org.junit.runners.Suite;
+import org.junit.runners.Suite.SuiteClasses;
+
+@RunWith(Suite.class)
+@SuiteClasses({ TestPlatformWorkAround.class, TestSerialPlotterFilter.class, TestTxtFile.class, TestWorkAround.class,
+        TxtWorkAroundRegression.class, TestVersionCompare.class })
+public class AllJUnitTests {
+
+}