Fix single-frame lag in camera yaw/pitch, tune view bobbing and add wielded tool movement when walking and tweak stuff a bit

Fixed null pointer dereference errors found by cppcheck

Make client report a newer version number to the server than 2011-07-31 does and make the server enforce it

Simplistic wielded tool lighting, added setMeshVerticesColor to utility.h and refactored some other code into calls of that

Create a separate scene manager for the wielded tool. This fixes the glitchyness in large map coordinates and some depth buffer problems. (The tool doesn't bob anymore when walking, this will be fixed later.) Fix MSVC build (thanks to dannydark).

Convert any inventory item into a mesh, bring back InventoryItem::getImageRay(), some const-correctness fixes