Remove Dynamic context field from ReactComponent

[elsassph]

ReactComponent has a var context:Dynamic variable.

It's better to define it in your ReactComponent subclass as needed, with the right typing.

[kLabz]

Did you take a look at the new context API? (I didn't)

[elsassph]

Not in detail but it essentially looks like a HOC for getting the context value. If anything it justifies even more to remove the field.

[kLabz]

Should we just add @:deprecated for a few versions? (or until v2.0 with new jsx and without the refs API)

I have no idea if anyone is actually using it.

[elsassph]

Yeah we could mark everything deprecated and remove in a 2.x