TODO detail on about interfaces in the docs

[trusktr]

I see that I get a warning, but things still compile, and basic tests pass. Is there a case they don't work?

WARNING AS100: Operation not supported.

 export class Vector2 implements Foo {
                                 ~~~

[trusktr]

Ah, I see the comment at #146 (comment). So basically they're useful if I rely on my editor to tell me if I'm doing them right/wrong, not relying on asc.

[trusktr]

Changed title to TODO, I feel like docs could explain this part a bit more. Currently the only thing mentioned is in Limitations:

Another major bummer is that object oriented programming is still missing some of the building blocks to support interfaces (here: virtual members in general)

[stale]

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