Compile string literals as stdlib Strings

[segiddins]

• [x] Update stdlib
• [x] Update examples
• [x] Ship the stdlib inside the runtime framework
• [x] Make detecting stdlib presence more robust
• [x] Allow string literals to be coerced to *Ints?

[harlanhaskins]

I'd say definitely -- if we can demote a String to *Int8 automatically it'll help interface with C tremendously.

[harlanhaskins]

This will need updating once we merge #36

[segiddins]

Still uses a string compare, but other than that using the stdlib is now much more robust!

[segiddins]

A super nice side effect to this is that -emit ast no longer includes the stdlib unless you add -show-imports!

[harlanhaskins]

🎉 Why is that?

[segiddins]

Why is that?

Because you no longer explicitly pass in the stdlib files to be compiled

[harlanhaskins]

Oh! Right! 😃

[harlanhaskins]

:shipit:!!!!!!!!!!!!! (once CI passes)

[segiddins]

🚢