State namespace alias

Nobody has claimed this yet.

The state namespace should be something that can be aliased according to dev/team preferences as an authoring convenience.

```css
@namespace s url(http://css-blocks.com/state);
:scope[s|active] { font-weight: bold; }
```

We should also allow states from a block (which are element names in selectors) to have a namespace declared:

```css
@block-reference theme|button from "design-system/button.block.scss";
@namespace s url(http://css-blocks.com/state);
:scope[s|active] { font-weight: bold; font-weight: resolve("theme|button[s|clicked]")}
```

In reference to https://github.com/css-blocks/css-blocks/issues/96, this would allow us to have a way of making a reference to a collection of blocks:

@block-reference theme|* from "design-system/all.block.scss";

No files or tests are named. Start by reading the requested syntax here and the referenced issue #96, then trace how namespaces, block references, and state selectors are currently handled. Done means aliases work for the state namespace and namespaced states from referenced blocks support both selectors and resolve() references.

Written by the indexing model from the issue text.