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Add a way to capture error messages. #82

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@SpaceManiac

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@SpaceManiac

For languages with error handling facilities, it would be useful to be able to capture messages output to sf::err() from CSFML. I suggest an API like:

sfErrorCapture* sfErrorCapture_start();
const char* sfErrorCapture_get(const sfErrorCapture* capture);
void sfErrorCapture_end(sfErrorCapture* capture);

I tried to implement this myself using std::ostringstream, but it seems like something is going odd in linking and each CSFML module has its own copy of the sf::err function, so placing these functions in the system module means that errors from other modules are not redirected.

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