Some fixes and small changes. Also added pdf
Removed most of sec 4.2.
Small changes in 4.3
Add soft shadow content
Fixing some errors
Minor changes
Merged figures
Deleted figure
Delete figure
Some changes, Chap. 4 figures
Last changes before feedback
Started refactoring Einleitung
Extended sec. cone tracing
Finished "wir" refactoring chap 3
Refactoring Chap. 4
"Wir" refactoring of chap. 5