[Merge] lp:~michael-sheldon/ubuntu-download-manager/snap into lp:ubuntu-download-manager

[Michael Sheldon]

I've updated the branch to remove the use of QDir::separator(), I'm curious as to why it's discouraged though? I can see in the case of snap things it's probably unimportant, but separator() would appear to be a more platform agnostic approach in general for applications that may be running on systems with a different separator character (e.g. Windows)
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https://code.launchpad.net/~michael-sheldon/ubuntu-download-manager/snap/+merge/311611
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