See extented description ...

- modified G_RadiusList to use lists
- modified G_GetNearestEnt to use lists
- modified G_GetNearestPlayer to use lists
Multiple changes

- added additonal documentation
- modified G_GetEntityByTargetname to use list
- modified G_GetEntityByTarget to use list
- modified G_GetEntityByBmodel to use list
Merge remote-tracking branch 'origin/list' into locations