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[NATIVE #5] Infinite loop protection (#186)

* refactor rttc to use node and not context

* add tests to show which line interpreter currently throws error

* some basic error handling

* added test and refactored error handling

* function representation as string finally working

* enabled some tests to use native

* enabled some tests to use native, handled some easy cases of undefined variable and constant assignment errors and convert them into SourceErrors

* format

* refactor out function to evaluate binary expression

* refactor out function to evaluate unary expression

* add checks for strict types in unary and binary operations

* fixed a bug where constant redeclaration in last line of code did not give correct location for error

* add check for infinite-calling tail recursive functions

* added check for while and for needing condition to be boolean

* refactored some ast creators

* basic infinite loop protection

* clarified infinite loop detection error

* add needed initaliser for sourcemaps to work on browser

* add needed initaliser for sourcemaps to work on browser

* format

* unexport rttc, comment console log

* Unexport rttc, comment console log

* Refactor global ids

* Change getting of elaborate only when verbose is enabled

* update tests

* Add globals and builtins to list of used identifiers, fix wording

503 of 569 branches covered (88.4%)

Branch coverage included in aggregate %.

1614 of 1765 relevant lines covered (91.44%)

348535.5 hits per line