Makefile.dependencies: now arbitrary binary extensions are possible
MEX: Add automatic dependency detection to Makefile

Also, parallel builds (e.g. make -j4) are now possible
Also, things are rebuilt if Makefile has changed
apf::parameter_map overhaul

* derive from std::map instead of composition
* now also non-const operator[]() throws
  * from now on, new values can only be added with set()
* throw std::out_of_range instead of std::range_error (like std::map does)

* add unit test for parameter_map (finally!)
Changes based on apf::parameter_map changes
Display requested renderer options on startup

But only if verbosity >= 2 (e.g. with command line option -vv)