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Fix let (requires prelude to be merged first) (BREAKING CHANGE) (#321)

* Add prelude, that predeclares Source-implementable functions

List and stream functions that can be implemented in Source
now are put in the prelude, and are no longer native JS functions.

* Update tests

* Add tests for stream

* Add tests for stream

* Add tests for stream

* Fix bug where mutating variables in a outer scope didn't work properly

* Make mutating let variables in outer scopes propagate properly

* Order imports

* Remove redundant assigning for constant

* Revert yarn.lock

* Remove inconsistent snapshot

* Add check for undefined variables too

* Update tests

544 of 615 branches covered (88.46%)

Branch coverage included in aggregate %.

120 of 120 new or added lines in 8 files covered. (100.0%)

1709 of 1844 relevant lines covered (92.68%)

329828.6 hits per line