合同查询
Merge branch 'master' of https://github.com/UniCloud/FRP

Conflicts:
	UniCloud.Presentation.Purchase/Contract/QueryContract/QueryContractVM.cs
	UniCloud.Presentation.Service.CommonService/DocumentExtension/ListBoxDocumentItem.cs
	UniCloud.Presentation.Service.CommonService/DocumentExtension/ListBoxItemHelper.cs
	UniCloud.Presentation.Service.Purchase/Service References/Purchase/Reference.cs
	UniCloud.Presentation.Shell.Web/ClientBin/Purchase.xap