#3: Added icon for "AlwaysOnTop"
#3: Expose "AlwaysOnTop"-Functionality to EDE-GUI
Merge branch 'feature/#3-EDE-AlwaysOnTop' into develop
[P] EDE 0.5.5

[+] Toggling AlwaysOnTop for current window
[*] Internal restructuring / refactoring
Merge branch 'preparerelease/0.5.5' into develop