BAR and Bren do not overheat after extensive use

[tt33]

These weapon's barrel over heated in real life and their lack over over heating in DH was a massive oversight in DH which artificially gave these weapons an advantage they did not have and also further encouraged these weapons to be used as a run and gun weapon.

The Bren overheats according to it manual after ~ 200 rounds the BAR was worse due to the thin barrel.

I'll see if I can't give the Bren a barrel change ( as well as an assault stance for both the BAR & Bren ) animation if I can however the BAR could not change barrels in the field.