Add lots of more Settings to the ones existing

[alfongj]

• Changing node and stroke sizes
• Different alphabets for auto-labelling
• Autosave enabled
• Interval of time between autosaves
• Default tree orientation

[alfongj]

If someone reading this thinks of more, please write them as comments if you wish :)

[alfongj]

Added file settings, more graphic settings and minimum undo actions.