Commit Controlesysteem 4 + Login 1

Vertaling van controle, overige errors weggecommentariseerd en controle
bijna af. Ook heb ik de login verbeterd, maar deze is nog niet goed.
Merge branch 'master' of https://github.com/Liontack/ProftaakP4

Conflicts:
	ProftaakP4_S25_D WebApp/ProftaakP4_S25_D WebApp/Aanwezigheid.aspx.cs
	ProftaakP4_S25_D WebApp/ProftaakP4_S25_D
WebApp/Classes/Shared/DatabaseConnection.cs
	ProftaakP4_S25_D WebApp/ProftaakP4_S25_D WebApp/bin/ProftaakP4_S25_D
WebApp.dll
	ProftaakP4_S25_D WebApp/ProftaakP4_S25_D WebApp/bin/ProftaakP4_S25_D
WebApp.pdb
	ProftaakP4_S25_D WebApp/ProftaakP4_S25_D
WebApp/obj/Debug/DesignTimeResolveAssemblyReferencesInput.cache
	ProftaakP4_S25_D WebApp/ProftaakP4_S25_D
WebApp/obj/Debug/ProftaakP4_S25_D WebApp.csproj.FileListAbsolute.txt
	ProftaakP4_S25_D WebApp/ProftaakP4_S25_D
WebApp/obj/Debug/ProftaakP4_S25_D WebApp.dll