v0.3

Change:

• Solar system will now generate instead of the static 3 planets
• Planets can now be of different types, the current defaults being "sun", "forest" and "lunar"
• Added a new unbreakable "plasma" block that generates on the sun. 
• The game will now generate new solar systems when flying far enough away from the sun
• Added a toggleable noclip in order to access other planets for testing. Press "V" to toggle it.