[added] Unit test to catch loot item chances not summing to 100%
[fixed] Loot group items not summing to 100%
[fixed] mantis 4264 balanced loot kit drops

Change-Id: Ie40094bb706625dd0f7c66531489ef6937359a77
Merge "[added] Unit test to catch loot item chances not summing to 100% [fixed] Loot group items not summing to 100% [fixed] mantis 4264 balanced loot kit drops" into unstable