Module Syntax Support

[Hou-Rui]

Add import syntax to js-slang to use modules.
This branch is based on a very old version of js-slang and thus need manual mergings.

[coveralls]

Pull Request Test Coverage Report for Build 2868

• 64 of 85 (75.29%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 87.896%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/modules/moduleLoader.ts	16	18	88.89%
src/errors/errors.ts	6	10	60.0%
src/transpiler/transpiler.ts	30	36	83.33%
src/interpreter/interpreter.ts	12	21	57.14%

Totals
Change from base Build 2853:	-0.2%
Covered Lines:	5049
Relevant Lines:	5536

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💛 - Coveralls

[martin-henz]

Ive advised the non-det team to avoid the confusing term "hoist" in their implementation in src/interpreter/interpreter-non-det.ts
So for example hoistVariableDeclarations will just become declareVariables etc.
Can you please change interpreter.ts accordingly? Thanks.

[Hou-Rui]

Ive advised the non-det team to avoid the confusing term "hoist" in their implementation in src/interpreter/interpreter-non-det.ts
So for example hoistVariableDeclarations will just become declareVariables etc.
Can you please change interpreter.ts accordingly? Thanks.

Okay, changes committed.

[martin-henz]

looks good to me.