Portability

[amosonn]

Made a few modifications which allow using this tool in a more portable way:

• Allow custom font names: "Arial" only works on windows
• Added "inner" function do_draw, which lets us handle the image in a custom way (e.g., displaying in a jupyter notebook)
• Add parameter disabling prints from algorithm functions, to allow running them in a larger loop

Also fixed a bug in TGF writing, where the newlines were written to stdout and not to the file