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Fix backtracking for Source 3 non-det variant (#690)

* Remove deep copying from amb

* Add undefineVariable method, and use it in evaluating declarations

* Modify variable assignment

* Modify function declaration

* Do not pop environment for primitive (non source) functions

* Add additional flag to getVariable, so that un-assigned variables can be looked up, for backtracking

* Remove deep copying from ambR

* Change backtracking in array assignment

* Add language parsing example as a test case

* Add for loop test case

Co-authored-by: - <->
Co-authored-by: martin-henz <henz@comp.nus.edu.sg>

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