Added a lot of features. Added customer class, added Register customer, Select Customer, Renamed some methods in DBConnect, rewrote the old queries, now we have better security and readability.
Merge branch 'Auto_Detail' of https://github.com/dinkelstefan/Project-Qars-Windesheim into Auto_Detail
Small Bugfixes
Merge branch 'Auto_Detail' of https://github.com/dinkelstefan/Project-Qars-Windesheim into Auto_Detail

Conflicts:
	Qars/Qars/RentCarPanel.cs