Fixed multiple issues with the modpack installation system revolving around the cache.

Files were being cached with the modpack build version in each zip name instead of the mod build version in each zip name, resulting in overwriting errors.

Cached zips were not being correctly cleaned up on new builds.

Signed-off-by: Dalton Pelc <daltonjpelc@gmail.com>
Updated PlatformConstants back to /api/ from /apiv2/

Signed-off-by: Dalton Pelc <daltonjpelc@gmail.com>
Added run/download count pings for tracking platform pack numbers.

Signed-off-by: Dalton Pelc <daltonjpelc@gmail.com>
Added validation to the AuthenticationService

Signed-off-by: Dalton Pelc <daltonjpelc@gmail.com>