New context API [Proposal] about surface HOT 2 CLOSED

Update:

Since we now have to explicitly declare context variables, there's no need to implement the end_context/1 callback anymore so it will be removed from the API. There will be only an init_context/1 callback which should return the values to be added. The values will be automatically merged to the context and automatically removed at the end of the scope. Example:

context :set, field, :any

def init_context(assigns) do
  {:ok, field: assigns.field}
end

from surface.

Closed in #44

from surface.