Decoupled `IsValidRewardItem` from repeatable config
Made `IsValidRewardItem` public
Added `RequiredItemTypeBlacklist` to Completion config, Blacklisted ammo
More nullguards
* Rename `Assets` to `SPT_Data`
* Added GZ 20+ variant to repeatable quest system #395
* Repeatable code cleanup
* Removed PMC level check for repeatable Quest pool generation #395
they will always generate for both GZ variants
* Rename `Assets` to `SPT_Data`
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Co-authored-by: Chomp <dev@dev.sp-tarkov.com>