Multiple improvement !

Space Probes has received big update :

- Several graphics improvement (too many to explain :p)
- Choose Ship color (8 colors)
- Big ships burn after 50% Health down
- Some levels have been improved
- A lot of little things here and there ...

Hope you like theses changes.
I will continue to add things throughout the year, for fun.
Do not hesitate to help me if you have great ideas.