[Add Feature] Check Mod-File integrity aka force redownload mod files

[DarkNachtara]

To help with faulty downloadet mod-packages enable in the debug section the option to force redownload mod-packages
also have an option to verify MD5-checksum in cache against online packages to see if a mod-file is faulty or tempered with.

[mircearoata]

All of this is already happening before extracting the mod files (and has been the case since SMM v2.1.0 in July 2020). So that is every time you install/remove/enable/disable a mod, turn mods off/on, or change the profile.

However, there is no check currently for the extracted mod files, since their hash is not stored on ficsit.app, just the hash of the zip as a whole.

[DarkNachtara]

I know but I got an SMM crash and SMM wouldn't check the check-sum of the in-cache mod-packages so there were faulty (bc the crash).