Use std::list for free list.
Use std::list for free list.

jaynus/entityx,Bablawn3d5/entityx,Bablawn3d5/entityx,drewet/entityx,asmodehn/entityx,arvidsson/entityx,arvidsson/entityx,drewet/entityx,asmodehn/entityx,alecthomas/entityx,alecthomas/entityx,jarrettchisholm/entityx,jarrettchisholm/entityx,jaynus/entityx,Bablawn3d5/entityx,asmodehn/entityx,jarrettchisholm/entityx,asmodehn/entityx,jaynus/entityx,alecthomas/entityx,arvidsson/entityx,drewet/entityx