Class name "srcSAXController" prevents static linking with libsrcml

[toBeOfUse]

Since libsrcml and srcSAX both have a class named srcSAXController, they can't both be used in one executable with static linkage. (I see this problem when trying to use them both on Windows, but I think it would actually happen on Linux as well, since both platforms use archives of object files for their static libraries.) A solution would be to put put this library's code in a namespace, to reduce the number of global names it adds and prevent collisions.

(In general, srcSAX's contents should probably be namespaced to prevent these issues. Google's C++ style guide says:

With few exceptions, place code in a namespace... Namespaces wrap the entire source file after includes, gflags, definitions/declarations and forward declarations of classes from other namespaces.

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