Added camera class to encapsulate information about the camera position and the field of view.
Integrated camera into main loop.
Implemented basic functionality of WASD movement.
Added display reset on every loop runthrough in MainLoop.
Added class Movement to encapsulate the calculation of actual movement.
Moved functionality to set speed from KeyMapping to Movement in order to provide better division of functionality.
Integrated movement into main loop and coupled movement object with camera.
Implement functionality for keyup events handling for the use in common WASD movement.
Extendes testlevel and image assets for better visualization.
Added support for world and object data in primitive file format during world loading.
Changed object<->image mapping to use object names instead of file names.
Changed displayed level name to use existing world attributes.