update-state, transact without passing this

[petterik]

Could add new functions for interacting with a component that doesn't have to pass this

Example:

;; instead of:
(dom/button #js {:onClick #(la/update-state! this (fn [state] (assoc state :foo :bar)))})
;; Could have:
(dom/button #js {:onClick (la/update-state #(assoc % :foo :bar))})

Notice that:

• update-state returns a function and that this is gone.
• an anonymous function can be used to update the state, since the # char is not used to create an anonymous function.
• the function has the bang ! removed. Not sure if that's good naming.

Same for transact, possibly for the computed functions as well and others?

[petterik]

Might want to bind additional *props* and *state* vars as well, to access reads and state without passing this. Examples:

(la/read :people)
(la/state :foo)

Not sure if this is useful though.