[Bug 31784] Add support for VM snapshots

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=31784

--- Comment #4 from François Gouget <fgouget at codeweavers.com> ---
Created attachment 52529
  --> https://bugs.winehq.org/attachment.cgi?id=52529
Modified database schema to handle snapshots and more

The attached schema would make it possible to have multiple configurations
(snapshots) per VM.
* The VMs table entries would only describe the generic properties of a VM.
* The VMConfigs table would describe the specific properties of a given VM
configuration.
* A given VM could have multiple VMConfig entries. For instance the win7u VM
could have both ja and ko VMConfigs corresponding to Japanese and Korean
locales for instance.
* When submitting a job, instead of picking VMs the user would pick VMConfigs
which he may see as win7u+ja, win7u+ko, etc.
* The VMInstances table is for dealing with failover and load balancing.
* In this context what counts is that all instances of a given VM must have the
same set of VM configurations, i.e. the same set of snapshots.
* When a VM instance is in use, its VMSnapshot field would be set to point to
its current configuration (i.e. reference the corresponding VMConfig entry).

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