Feature Request - Minor Self Update at Runtime

I have yet to prove this is possible, so there is a chance this issue will be closed if it's deemed technically impossible.

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For each major release there are a number of minor releases, usually these include an updated chromium version, often with security fixes. In theory there should be no breaking changes in these releases, so downloading and overriding the CefSharp/CEF dlls at runtime should be possible.

- [ ] Manually test using minimal example

If the manual test is successful then there are a number of consideration
- Versioning of old files to allow rollback
- Write permissions
- Update checks
- Background downloading
- Binary diff