[CMake] Adding Code::Blocks support

[Michael Casadevall]

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I would like to add a new generator to CMake adding support for  
Code::Block Project Files, since Code::Blocks, while being an IDE,  
doubles as a full build system which supports quite a few obscure   
compilers such as the Digital Mars compiler that CMake doesn't  
support. I'm currently tracking head, but any tips on adding the new  
generator would be handy, and there a few things I've got questions  
about:

1. Compiler detection - How should this handled. Code::Blocks  
supports up to eight different compilers, and there is no way that I  
can find of detecting which compiler C::B is going to use. I could  
just try in turn every compiler CMake knows how to use, but not fail  
should it not find a usable compiler, and still generate the cbp files.

2. Library detection - See above.

3. Paths - C::B fairly anonying with path placement. The cbp file  
expects to be in the root of the source directory, and although this  
isn't a requirement, odd things sometimes happen (like I've seen C::B  
tell me a path is ../*path to source*, it either requires full paths  
(which I'm unsure if CMake supports) or relative paths.

4. Interworkspace Dependancies - As far as I can tell, Code::Blocks  
doesn't support multiple projects in the workspace

In a lot of ways, Code::Blocks works like KDevelop, so it's a good  
basis for this module.
Michael C.
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