fix a small parsing issue
abstract away IntelliJ's icons and colors
added navigation to Java class from arbitrary string
better handling of quote character insertion
added more informations to the structure view

Originally, each item in the structure view contained the file name
as a "location string". That, while correct, is completely redundant.
Therefore, the "location string" now contains information about the
'extends' clause, if the attribute has one.
small parsing issue fix
added #include navigation and completion
updated README and changelog
release 0.3