[FEATURE] Add a render system to the engine library

[XanatosX]

Is your feature request related to a problem? Please describe.
Add a system for rendering to the engine library. Add the required components as well.

Required features

• Sprite rendering
• sprite sorting on z
• text rendering (own system?)
• postprocessing with shaders
• shaders for single sprites

Describe the solution you'd like
A default render system usable out of the box

Describe alternatives you've considered

Additional context

[XanatosX]

#77