shiny breaking changes

• v1.7.5.1 \u2192 v1.8.0breaking

  Closed #3899: The JS function `Shiny.bindAll()` is now asynchronous. This change is driven by the recent push toward making dynamic UI rendering asynchronous, which is necessary for [shinylive](https://shinylive.io/r) (and should've happened when it was first introduced in Shiny v1.7.5). The vast majority of existing `Shiny.bindAll()` uses should continue to work as before, but some cases may break if downstream code relies on it being synchronous (i.e., blocking the main thread). In this case,

• v1.7.5.1 \u2192 v1.8.0breaking

  Since `renderContent()` calls `bindAll()` (after it inserts content), it now returns a `Promise<void>` instead of `void`, which can be useful if downstream code needs to wait for the binding to complete.

• v1.11.1 \u2192 v1.12.0breaking

  The return value of `actionButton()` and `actionLink()` now wraps `label` and `icon` in an additional HTML container element. This allows `updateActionButton()` and `updateActionLink()` to distinguish between the `label` and `icon` when making updates, and allows spacing between `label` and `icon` to be more easily customized via CSS.

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