Fixes

Added and renamed cmdlets
Changed some parameters of cmdlets to follow OfficeDevPnP.Core methods
Updated cmdlets to use OfficeDevPnP.Core
Migrated methods from PowerShell.Core to OfficeDevPnP.Core
Marked PowerShell.Core.SPOWeb class as obsolete (all methods are now on in OfficeDevPnP.Core)
Small fixes here and there.
**It feels like it's Friday! ;-)**