New Physics* classes.

Add new classes I am going to use in future.
Update from dev branch.

Updated all classes, Vector2D is available now.
Fixed project file.

Now QT sees all the headers and sources.
Lexicographical sort is also done.
Write some code to classes.

Classes Wheel and Body are nearly complete.
Also added cross product and rotation to Vector2D.
Mid-developing commit.

Commit before merge,
Merged from dev.

Fixed Event system.
Added matrix classes.
Added operations with vectors.
Write some more code to classes.

PhysicsChassis is nearly complete, one step closer to the main class
Vehicle.
Even more code to classes.

The vehicle class is almost complete.
Some bugs fixed.

Maybe now it is safe enough to check Vehicle class physics in some
sandbox.
New class - VehicleFactory.

The most useful method - createSampleCar.