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Instead of polling the promise, perform a state-transition out-of-band,
using a state-machine handle which is moved into the async closure.

Sprites are now stored in sprites.rs in the Sprite enum.  This
can be used to generate ImageHandles to generate Sprite
entities.

Sprites are loaded during loading state and are passed to the
ingame state.

Also make sure webpack will deploy the resources/ folder alongside
everything else.

We currently have a `state` and a `states` module.  This is confusing,
rename the state module to `gamestate` to make a more obvious
distinction.

Copy the constants from www/src/_rc3-colors.scss to a rust module as
well.

Currently a bit ugly because we're essentially polling the future, but
it'll do for now ...