Fixing bad memory handling in ECS #49.

Renamed mBuffer to mData and changed the data type from std::vector<Byte> to std::byte*.
Added m_capacity initialised to 16 instances of the archetype at construction.
Renamed Destructor to MemberFuncs and added a MoveAssign and MoveConstruct function pointer.
Replaced usages of typedef with using.
Fixed Archetype::push_back to now call move-constructors for the ComponentTypes.
Fixed Archetype::erase to now call move-assignment operator when re-positioning Components in non-end erase.
Added Archetype::reserve(Capacity).