Massive extension of the fuzzer (#1697)

Massive extension of the fuzzer (#1697)

Fix bug where a `throw` was generated without expression

Reenable try/catch/finally and fix them up

Skip serialization errors

Allow function decl in other funcs but not in blocks etc

Rename function to be more appropriate

Fix global functions not getting certain names

Make the canaries more likely to appear as expressions

Add a silly rounding edge case

Add a new canary, `c`, which should only ever be incremented

Refactoring

Fix (another) iife not actually being invoked

When a statement hits recursion max return an expression instead of `;`

When a expression hits recursion max also inc `c`

Generate global code as well as function code

Also fixes some argument juggling related bugs.
No longer reduces the recursion max when generating sub functions.
Generates a function arg.

Add used names to var name pool while in that scope

This is a little wonky, possibly a hack, but since it's synchronous code I think it's alright to do this. The alternative is to slice the varnames array and juggle them through almost all the generator functions and there are various reasons why this patch is a better alternative.

Minify generated code, not beautified code. Prevents beautifier bias.

Prevent unnecessary duplication

Remove serialization protection because I think it got handled elsewhere

Abstract toplevel code generation

Add example line of running test case

Add poor man options parser, and some options

Reindent to 4 spaces

Lower chance of `default` generation

Comment example of testing a case and output improvement

Enable `default` clause appearing at any clause index

Removing some training wheels; dont add parens where we dont absolutely need them

Support `-s1` and `-s2` to force specific statements being generated at that recursion level

Add round number to output when failing. For stats and fun and profit.

Solidify statement depth counting. The argument juggling is real.

Renamed option to something long. -scf was ugly and probably confusing.

Fix missing arguments causing `canThrow` to be truthy, generating crashing code

Generate more binary nested expressions

Add black and white list cli options for statement generation

Allows you to explicitly require or forbid certain statements from/to being made.

```
node test/ufuzz.js --without-stmt switch,try -t 5 -r 5 -V
```

```
node test/ufuzz.js --only-stmt ifelse,expr -t 5 -r 5 -V
```

Similar granularity for expression may be added later.

There can be no comma between names; it just does a split on that arg.

Trim down the binary expression generator

Prevent scoping issues in nodejs by preventing certain names in global space

Oh this list was incomplete?

Allow bin-expr to generate assignments too. More vigilant with storing and reusing vars.

Add more global builtin names

Update wrapper code

Also patch Function valueOf