Merge pull request #29 from Wohlstand/master

Merge to Update 29
Merge pull request #30 from Wohlstand/master

Merge to Update 30
Merge pull request #31 from Wohlstand/master

Merge to Update 31
Cleanup with callback-functions
Merge pull request #32 from Wohlstand/master

Merge to Update 32
Merge branch 'master' of https://github.com/KevinW1998/PlatGEnWohl.git
Merge pull request #33 from Wohlstand/master

Merge to Update 33
Merge branch 'master' of https://github.com/KevinW1998/PlatGEnWohl.git
Merge pull request #21 from KevinW1998/master

Cleanup History-Class