Rename all library targets to start with wx. This way it does not use generic
names like base or core that could interfere with other libraries that add
include the wxWidgets project.
Support checking for multiple versions, first check gstreamer-1.0, then gstreamer-0.10.
Add support for finding gstreamer-player.
Specify the required components, add the include directories and link with the libraries of the found components.
Set the setup variables wxUSE_GSTREAMER and wxUSE_GSTREAMER_PLAYER.
Add CMake build system for libraries, tests and samples
update_files.py converts build/files into CMake format.
build/update-setup-h has been modified to update build/cmake/setup.h.in.
