feat(launcher): ✨ Support copying session file from other installations #2828
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This feature is Windows-only, because on Linux the session file is written globally on ~/config.
It finds the installations with a session file and shows them in a dropdown when installing a new version. For the edge case where a session file gets deleted during the lifetime of the launcher and the corresponding version is selected, it will gracefully show an error. I don't believe we need to handle this edge case more.
This PR contains also some minor refactoring.