This includes:
* Change the Makefile so we can build the source with SDL
* Create a config file for all global variables
* Initialize a simple game loop to see something on the screen
* Stub for building a drawing lib
* Modify the README a little bit
* added special output directory for executable and object files
* improved configuration section
* supported multi source files
* fixed ugly warning in clean (... with ugly hack ^^)
* added SILENT and PHONY to tasks
* added dependency for run target
* split default task in compile (and optional other tasks)
* split compile in build of each object file and executable