Separate Windows Installer Registry Entries for JACK and ASIO

**What is the current behaviour and why should it be changed?**

Currently the JACK and ASIO Jamulus installers for Windows share a registry key. This is not optimal where both versions are wanted as updates and uninstalls "get confused".

**Describe possible approaches**

* We could keep things as they are now
* We could add subkeys for JACK and ASIO
* We could use separate keys for JACK and ASIO

For migration from the current approach, I think separate keys is probably easier although subkeys is probably the technically better approach.

**Has this feature been discussed and generally agreed?**

One of my [off-topic ramblings](https://github.com/jamulussoftware/jamulus/pull/3097#issuecomment-1629472433) kicked this off.