Peter Montgomery 4d460ec073 Delete 3D cache files with GUI settable number of days
KiCad stores 3D cache files but never gets rid of any of them.
This patch adds a new function called 'CleanCacheDir()'.  Any cache
files older than the passed 'number of days' parameter are deleted.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/1928
2020-08-09 10:41:45 +00:00
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