Move all the default build output locations to be under the main build folder

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73581 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Switch setup.py to use build.py for the actual building,
and set things up so commands like install or bdist_egg are
able to use the build as-is without having to build it.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73582 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Monkey-patch the distutils copy_file and copy_tree functions so they preserve symlinks.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73583 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Also copy the generated .py and .pi files into the sdist

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73584 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775