[TO REVISIT] Static Linking / Single Windows Executable

[elibosley]

Eventually we'd like to have a single executable on Windows, rather than an installer - the way to do this is probably with Static Linking the QT binary (which is allowed since our repo is open-source).

[elibosley]

Static linking is fine to do when your repo is open source, at least according to QT TOS.

I need to investigate further to ensure that it is allowed by the libraries that we use.