[z1946] Check group id of group loot timer when timer is started. Close pull request #39

Also fix a small possible bug with loot shared to players at similar position on a different map

Signed-off-by: Schmoozerd <schmoozerd@scriptdev2.com>
Signed-off-by: Nighoo <nighoo@gmail.com>

(cleaned version of a5345a9)

(based on commit [s1535] - 07eeaf9)