Revert " - first fixes"

This reverts commit 618babba4702faa55069e1867b1503f2fe8e9b90.

Reason: Commit used tabs instead spaces. Changes are implemented in second
commit.
Add code styles to project
Fix bug only starting one server

Also redesigned the control panel using three different buttons instead of
one. There is now the possibilty to cancel the server process instead
waiting for the cancel signal.