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added verbose error messages and test cases/snapshots for verbose error messages (#177)

* Add verbose error messages

* Fix bug where native error dummy node did not have enough fields

* Fix non-verbose interpreter error snapshots

* Add test cases, snapshots for all disallowed syntax rules

* Fix problem in which linter broke some snapshots

* Add test cases for CallingNonFunctionValue with arguments

* Remove obsolete snapshot

* Change elaborate message of noAssignmentExpression to be more helpful

* Add new test for NoAssignmentExpression

* Add new test case for NoUpdateAssignment rule

* Update snapshots

* Readd native tests which got removed

* NATIVE: Fix creation of dummy node when passing to exceptions

* Fix callee string generation in some interpreter errors

* Make astring imports consistent

* Remove unused function parseAt from parser.ts

* Remove always true conditional

* Use the correct nodes when hoisting identifiers

* Fix generation of VariableRedeclaration verbose messages

* Refactor code to follow better practices

* Change InvalidNumberOfArguments elaboration code to also handle function declarations

* Update test cases

480 of 528 branches covered (90.91%)

Branch coverage included in aggregate %.

1548 of 1652 relevant lines covered (93.7%)

13184.12 hits per line