Allow =version and /release selector on virtual packages

We already have code for figuring out if a virtual package is only
provided by a single provider (and otherwise show a list) we can
auto-select for the user, so we can adapt that to work with versioned
provides as well and while at it also release selectors.

The code tries to keep ABI backward compatible and hence turns
relatively ugly as we need a parameter (the selector) to be passed
around without adding a parameter or new virtual methods.

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