Added are_true, apply_to_type_list, tuple_to_moved_args.
Fixed tuple_to_args for empty tuples not calling the function.
Improved clang diagnostics (do not hide template intermediate steps).
Fixed delegate with r-value reference function parameters.
Optimized signal/slot for netcom requests by introducing
unique_signal_t (can only handle a unique connection at once).
Made signal/slots compatible with r-value arguments (only usable for
unique_signal_t, since it is the only signal that can move its
arguments).
netcom::request_t should now be received either by r-value reference
(faster) or by value, but not by const reference.