version 0.4 released

Changes:

• Player now spawns on the ground after a moment of world simulation.
• Player can now jump off of rocks.
• Burst controls changed. Click to burst in any direction. Old controls still work too, with space also being usable.
• Camera now pans out when the player is high enough.
• Added a loading screen.

Fixes:

• Player is no longer able to clip outside of bounds.