Merge branch 'gui2' of github.com:usi-skladovy-system/a7b36usi-skladovy-system into gui2

Conflicts:
	source/src/main/java/cz/a7b36usi/sklad/App.java
	source/src/main/java/cz/a7b36usi/sklad/Controller/LoginController.java
	source/src/main/java/cz/a7b36usi/sklad/Controller/MainController.java