Makefile for a more convenient compilation

The new Makefile can compile the C programm based on
the passed command line Arguments:

Variables:

MODE - can take the value 'debug'
       Should always be set for now!

PLATFORM - can take the value 'rpi'
           Use when compiling on the Raspberry Pi.

RUNAS - can take the value 'daemon'
        The program will start as background process.

Whenever the variables have no values or when
they are simply not defined, they will be ignored.

As an example call the application compiled for the
Raspberry in debug Mode as a daemon process:

'make MODE=debug PLATFORM=rpi RUNAS=daemon'
Minor changes

Relocated existing-, and included new dependencies.