olidacombe

The duktape pimpl `LambdaHelper::invokeFromDukContext` can lead to a throw from `safeCall` that isn't caught when the invocation came from a timer callback, e.g. ``` setTimeout(()=> { clearTimeout("a bad argument causing...

Some, like me, who use [oil.nvim](https://github.com/stevearc/oil.nvim), [nvim-tree](https://github.com/nvim-tree/nvim-tree.lua) or similar, will get errors on `:RustOpenExternalDocs` with this: ``` Unknown function: netrw#BrowseX ``` This PR adds the capability to override url opener....