batch-rename: Automatic Numbering Start Value

When using the Batch Rename tool, there was no way to make the numbering feature start at a value other than 1.

Added a numeric spinner control to the layout, allowing the user to enter the starting value of the automatic numbering counter.

Fixes #994
1 job for issue994 in 12 minutes and 27 seconds (queued for 1 second)
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Status Name Job ID Coverage
  .Pre
passed flatpak devel #540443

00:12:27