Implementation of some command / protocol helper functions.
These should take a file descriptor...
Added file descriptor to receive_int and receive_long's arguments.
Using new functions to read int / long now.
Had to make some things static.
Fixed bug in long and int functions. Added a function for characters.
Made everything static.

Updated the descriptions of receive_int and receive_long - they still mentioned STDIN and not a file descriptor.

Added the receive_char function.
Hello world test :)!
Start of a fake arduino class with circular buffers for fake serial ports.