Added a test for Class2HTML

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/bcel/trunk@1646788 13f79535-47bb-0310-9956-ffa450edef68
Implement constantToString for MethodHandle, MethodType and InvokeDynamic

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/bcel/trunk@1646789 13f79535-47bb-0310-9956-ffa450edef68