Some tests for `eval` assert the equality of key enumeration on the
global object, comparing the ordering when the object is referenced
through eval.

Based on the test bodies and the "info" field in their metadata, these
tests appear to have been written under the mistaken impression that
erroneous creation of an environment record would be observable through
the `this` value.

In reality, the value in such cases resolves to the global object. That
renders these tests redundant and overly complex--none of the
distinctions between each test actually demonstrates a different
behavior.

Remove the redundant tests and introduce three new tests asserting the
correct resolution of the `this` keyword for direct eval code from
within the global scope and from within function scope.

Introduce test generation tool

See the proposal at
https://tc39.github.io/Function-prototype-toString-revision/

Because Test262 asserts the strict equality of
`Array.prototype.toString` and `TypedArray.prototype.toString`, tests
for properties of the object do not need to be reproduced in both
location.

Ref gh-526

https://github.com/tc39/proposal-string-pad-start-end/issues/23

Closes gh-564

Ref: https://github.com/tc39/test262/pull/536#issuecomment-200455389

Correct example in contribution guidelines

Test specific behaviour for Integer Indexed exotic objects, WRT the
following internal methods:

- [[GetOwnProperty]]
- [[HasProperty]]
- [[DefineOwnProperty]]
- [[Get]]
- [[Set]]
- [[OwnPropertyKeys]]

Avoid false positives

As written, the example for asserting runtime errors is written with an
early error. Because the error is expected to be reported prior to
program execution, the `assert.throws` function cannot be used to detect
it.

Demonstrate the usage of the helper function with a runtime error.

Add syntax tests for declaration restrictions

Add tests for Number.{MAX,MIN}_SAFE_INTEGER

Add tests for `debugger` statement

As written, the test for `Math.random` would pass if the runtime
erroneously produced a non-numeric value. Add the necessary assertions
to guard against this case.

Improve coverage %ThrowTypeError% and default class constructors

Make asynchronous test configuration explicit

Assert that declarations are not permitted in positions reserved for
statements only.

Update meta data: `id` to `esid`

The project's expected frontmatter tag name changed while these files
were under review.

The runtime semantics of this statement are host-defined and therefore
untestable, but the statement's affect on the formal grammar should be
consistent across all implementations.

V8 ran into an issue where the YAML parser our test setup is using
didn't understand the newline, and failed to parser the negative
test expectation below, causing the test to fail. This patch fixes
the issue.

Fix test bugs