fix 86

- upgrades which change weapon caliber also change silencer affinity
(thx to kv0)

- RPK74 can no longer mound grenade launcher (thx to kv0)

- MP5 'FRASIER' uses proper silencer now (thx to kv0)

- 'GROZA-1' uses proper silencer now and is not called 'Storm' any more
(thx to kv0)

- description of TRG now mentions silencer affinity (thx to kv0)