TypeScript Support

[braxtonhall]

TypeScript and JavaScript are now both kinda working

Requires actual oracles, but interactive testing was going well. I noticed some slowdown on the latest commit so I may need to revisit the V8 memory management.

Also, the biggest problem right now seems to be making this somewhat portable. You need a different j2v8 dependency for different operating systems. maven supports using an environment variable for this kind of thing, but IntelliJ doesn't.

• [x] Figure out why it's suddenly slow
• [ ] Add oracles
• [ ] Sort out j2v8 dependency
• [ ] Figure out how script target in TypeScriptVisitor should be set (it's probably fine)
• [ ] Calculate scope similarity in TypeScriptParser