fix the 'Sideloading of apps is not enabled on this site' problem with PowerShell

In case you are developing an app for SharePoint 2013 and you are not developing on the server you can get the error 'Sideloading of apps is not enabled on this site'. When that happens you do not have the sideload developing feature activated. It is a hidden feature and allows you to develop apps from client devices. All you need to do is to enter the following line into PowerShell on the server.

Enable-SPFeature e374875e-06b6-11e0-b0fa-57f5dfd72085 –url <yourSharePointURL>

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