Klever

At the moment raw build commands are extracted and pushed to a queue in a pure text format for further processing. Then they are processed and many of them are filtered out since they are for service purposes, e.g. to understand what options a used compiler supports. So, it has sense to process and filter them immediately after they are extracted.

BTW, it turns out that implementation of build command wrappers in Python decreases build time just in 5-10%. Thus there is almost no sense to implement them in C as was requested originally.