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Refactor loop scoping (#65) (#68)

* update test cases

* Refactor block frames

* add test case for constant consts

* make const declarations immutable in the environment

* update tests for const updating

* Add an error message when trying to assign to a const expression

* updat block scoping tests to reflect new expected behaviour (see https://github.com/source-academy/js-slang/issues/65#issuecomment-425618227)

* Revert "Refactor block frames"

This reverts commit eb7e9ae48.

* update block scoping tests

* statically bind loop variables in the block frame

* make function declarations constant

* add failing test for empty expressions in for

* Throw runtime errors if any of the expressions in a for statement are missing

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