Update plugin test framework to junit5

Updates the testing infrastructure to use the latest relesae of junit and
leverages the new extension mechanism to create an easy to use testing
framework.  Also adds additional test coverage for several plugins.

game/src/test/kotlin/org/apollo/game/action/ActionCoroutineTest.kt

@@ -1,7 +1,7 @@
 package org.apollo.game.action
 
-import org.apollo.game.action.ActionCoroutine
-import org.junit.Assert.*
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
 import org.junit.Test
 
 class ActionCoroutineTest {
@@ -29,7 +29,6 @@ class ActionCoroutineTest {
     fun `Coroutine cancels on stop() calls`() {
         val coroutine = ActionCoroutine.start {
             stop()
-            wait(1)
         }
 
         assertTrue(coroutine.stopped())