WIP: Fix pipeline support for Version property for *-PSResource cmdlets

[anamnavi]

PR Summary

Add pipeline support for the -Version parameter with ValueFromPipelineByPropertyName = true. Previously, the -Version parameter was being parsed and set to a default in BeginProcessing() however to support this for pipeline input, it should be parsed in ProcessRecord(). Uninstall-PSResource doesn't need an InputObject parameter set, as it can just read properties by name for the piped in PSResourceInfo object.

PR Context

To fully support pipeline input, resolves issues #482

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[anamnavi]

ask @alerickson if default -Version value should be VersionRange.All for Save-PSResource and remove TODO

[anamnavi]

opened #510 and #511 instead.