c74cc2675e
This is needed primarily for a workaround for #7971. When importing a template that has been exported on Ardour5 on MacOS we need to fix the paths of the archive entries. Later we can use this functionality also to handle imported templates if templates with the same name already exist. This commit only adds methods and members to FileArchive, it does not modify anything to make regressions unlikely. This, however, leads to some duplicated code. Eventually we should consolidate this a bit.
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