Início do agendamento;

Algumas correções básicas.
Merge branch 'master' of https://github.com/thiagomartins89/EngSoft-dos-brothers

Conflicts:
	OldButGold/src/GUI/WindowClientVehicleRent.java
	OldButGold/src/GUI/WindowEmployeeVehicleRent.java
	OldButGold/src/GUI/WindowReturnVehicle.java
	OldButGold/src/GUI/WindowWithdrawalReceipt.java
	OldButGold/src/control/MainClient.java
	OldButGold/src/db/Rent.java
Mais avanços no agendamento(cliente).