Fixed most bugs, cleaned shaders and added DOF

• Added depth of field (bokeh convolution)
  
• Original shaders now definitely work
  
• Compute shader folder was sorted
• All shaders were cleaned
• Added random number generators, so you can implement path tracing for example
• Now ray marching uses over-relaxation, should be slightly faster

• Folder contents are now sorted so you get the same results on every system
• Bloom halo-box bug fixed