It's now safe for concurrent access.
Output checking looks better.

This also fixes a deadlock in the tests.

Blocking event package

If a state gets reset and you still hold a pointer to the previous,
incorrect, state object you'll operate on the wrong object. Using the
state to set/get objects and attributes you won't have this problem
since the state will always have the correct object.

* CALLVALUE pushed incorrect value to the stack
* Set execution model to closure

Standard VM should be about 10x faster than the debug VM. Some error
checking has been removed, all of the log statements and therefor quite
some unnecessary if-statements.