Add breadcrumb support to text editors

It would be good to add a breadcrumb in the top of our editors. This is how it looks like in the java plugin:

It should be available in all of our editors (ttcn3, ttcnpp, asn1, config).

Tasks:

• breadcrumb should start with the full file path
• at the end, hierarchy from the file (like functions, classes) should be added dynamically
• if possible, extra icon markers (like error markers) should be implemented