Implement Error cause and other Error specs

[KurtGokhan]

• Added Error Cause
  • Stage 4
  • Specs: https://github.com/tc39/proposal-error-cause
  • MDN: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/Error
• Refreshed the test262 for Error specs. Some of them were failing, so fixed them.
• Also added test for Access to an indexer of a userdefined csharp class failed. #534

[sebastienros]

Was looking at all the proposals and what stage 4 means, FYI:
https://github.com/tc39/proposals/blob/master/finished-proposals.md

Not sure which ones haven't been implemented in Jint.
And there there are all the features that are in stages 0/1: https://github.com/tc39/proposals

[KurtGokhan]

I implemented this one specifically because it was mentioned at #921

Maybe we can do a compat-table for Jint to detect all missing features. https://github.com/kangax/compat-table

[lahma]

Looking good.