Plasma::Package internally uses KPackage, being a pure wrapper.
old client code and old packagestructures still work using the wrapper.
old workspace code that is not directly using kpackage continues to work correctly
Change-Id: I05f95e8d05e3b67759973c4009e3753c61b1dcce
All cpp code moves into the src/ subdirectory, as the Frameworks policy
suggests.
Directory structure should now be in line with other, future frameworks.