DL_cache_folder automatic cleanup (but not wiping)

[SoftwareSimian]

It would be nice if the installer could automatically clean up outdated versions of DLC. There is an option in the installer to wipe the entire folder at the start of the process, forcing a re-download of all DLC which is sort of a sledgehammer fix. I manually go through \World_of_Tanks\Aslain_Modpack\DL_cache\ every now and then and look for near-duplicate filenames and purge the old ones, but it might be nice if the installer could (optionally, at least) do this automatically, since not every DLC is updated with every version (some of my selected DLC is 10 months old but still valid).  The installer could do a simple check when writing a DLC file, say "Aslains_HDR_GoldPremiumTanks_TIM_1902.7z" to look for other "Aslains_HDR_GoldPremiumTanks_TIM_*.7z" that isn't the currently-downloading filename.