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Updated build files

Update bytecode and constpool upon context restart. This way the restarted method can execute new code. This allows for fix & continue workflow. Should check for exceptions - will do it later.

More tests for fix & restart support.

Set parser to allow assignment to pool variables. This is certainly a hack, but parser currently does not support per-class/per-method settings and here we assign to a prool vars by purpose. Changing the settings in preferences does not work (there's a bug somewhere).

Update compiler problems when old class is updated.

Preserve method identity when updating class methods (when possible). Upon class update, method identity is preserved when possoble. As a consequence, when method is bytecode interpreted, this allows for installing new bytecode and restarting existing context with new code.

Makes JavaUnresolvedCompilationError proceedable. When the error is proceeded it causes the errorneous method to return. Returned value is the default value of the return type (i.e., zero for numeric types and null for void and object types). This enhances the incremental development so one can fix the code and proceed. If the caller does not use the return value, everything is just fine.

Added JavaUnresolvedCompilationError. This one is raised whenever Java code reaches unresolved code / code with errors. This is dove by translating exception thrown by ECJ-synthetized error code into smalltalk exception. This has two advantages: 1) allow for easier handling of this un user code 2) it is not handled by thread error handler so when raised, it does not cause silen thread death.