future of the repo / plan to upgrade (the callback and random-code-nofree branch)

[srghma]

related to

• unable to build currently purescript-concur-vdom-starter#4 (comment)
• https://github.com/purescript-concur/purescript-concur-vdom/issues/2

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State:

1. the latest branch is random-code-nofree.
2. the internal type for Widget was changed.

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Plan:

1. the purescript-concur-react should be updated (https://github.com/purescript-concur/purescript-concur-react/tree/callbacks - but it is stale)
2. the purescript-concur-vdom should be updated, maybe not working at all
3. examples should be added to purescript-concur-vdom similar to https://github.com/purescript-concur/purescript-concur-react/tree/master/examples
4. the https://github.com/purescript-concur/purescript-concur-core/compare/random-code-nofree is using Observer data type, which is the same is https://github.com/paf31/purescript-event/blob/master/src/FRP/Event.purs.
   Observer should be replaced with Event since this lib is used in halogen

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Would be cool to implement:

1. type safe html (similar to https://github.com/purescript-halogen/purescript-halogen/blob/c4e3107f55485e2ca7503aec624be43a8e3f78b3/src/Halogen/HTML/Elements.purs#L224)
2. examples from halogen in concur - https://github.com/purescript-halogen/purescript-halogen/tree/master/examples