First cut of stateGen example

[myitcv]

• First cut of an example that uses stateGen to generate a typed global state tree from a simple template
• "Vendor" myitcv.io/sorter in order to use sortGen (code generate sort functions based on order functions for immutable slices)
• First cut of an immutable-aware <select> component: myitcv.io/react/components/imm.Select
• Fix variable name clash in generated component code
• A rather lame effort at trying to improve docs in a couple of places...