- fixed getParseTreeNodes
- fixed getting name for TypeNode

- some more class stuff

- added CompEnv, which is a special enviornment for CompNode where it
also stores the imported stuff and the package name, so you can search
the globalEnv with those as well
- added type linking to ClassNode, where it checks the extends and
implements classes/interfaces and makes sure that they are real, and
stores them as the nodes in ClassNode