Integrate the event loop
The libevent is compiled into the library and created. The interface now supports watching for process termination, but nothing more. Watching eg. file descriptors won't be needed for some considerable time if ever, with the exception of the process manager. The process manager will be implemented in #4 (closed) and will integrate tightly into the events structure, so there doesn't have to be a specific interface.
There are some TODOs, but they are left for #20 (closed) (Logging support).