[CMake] New CPack WiX Generator Component Support

[Nils Gladitz]

I've staged a new topic "wix-components" that adds basic component 
support to the CPack WiX generator:
http://cmake.org/gitweb?p=stage/cmake.git;a=shortlog;h=refs/heads/wix-components

I would like to encourage anyone interested in this to inspect and/or 
try out the changes and provide feedback.

Would anyone be unhappy if I would postpone support for component 
inter-dependencies?
I haven't yet found a proper way to handle these in WiX.

Nils