Hi Xi,
Missing of SharePoint tab is due the fact that OfficeDevPnP.Core is just class library project and does not really have any SharePoint deployment specific settings. SharePoint tab only exists in SharePoint projects. This does indeed mean that there might be some challenges when you might need to change from 16 to 15, or using the core component in on-premises.
I'd though suggest to look into our Github project, where in the Dev banch we have the latest version of the package. There has been lot of changes on the structure and the code compared to this old package in Codeplex. We have moved over the development to the Github at https://github.com/OfficeDev/PnP.
Here's also link directly to the Dev branch - https://github.com/OfficeDev/PnP/tree/dev.
Missing of SharePoint tab is due the fact that OfficeDevPnP.Core is just class library project and does not really have any SharePoint deployment specific settings. SharePoint tab only exists in SharePoint projects. This does indeed mean that there might be some challenges when you might need to change from 16 to 15, or using the core component in on-premises.
I'd though suggest to look into our Github project, where in the Dev banch we have the latest version of the package. There has been lot of changes on the structure and the code compared to this old package in Codeplex. We have moved over the development to the Github at https://github.com/OfficeDev/PnP.
Here's also link directly to the Dev branch - https://github.com/OfficeDev/PnP/tree/dev.