vcl: move Window::ImplSetFrameParent() from window.cxx to stacking.cxx

Change-Id: I41ce1398017c7c9ff7b24464250911c63b3e2c92
vcl: move GetSystemData() & GetSystemDataAny() back to window.cxx

Change-Id: I46736950563776bb4f5fefd71789010541e99e70
vcl: cleanup window.cxx namespace aliases

Change-Id: I3b8782ed7bbd782dbca52cd4bec46582a9b35271
vcl: "non-pro version" actually means debug builds

Change-Id: I814869869bbc16a8bae94ef9c5deaeb97c13f03e
vcl: rearrange function in window.cxx

Change-Id: Icb7f692cdf03a77573379257b34400f38def71ec
vcl: move functionality from window2.cxx

Change-Id: I68d1c7bb32df9024ea57a07d7d3b051efc08b2ed
vcl: move clipping functions from window.cxx into clipping.cxx

Change-Id: I2a2c3d6283c962bba2994de04bbd869a79fc2eca