v0.7

Changes since v0.6:

• Added simple ambient occlusion, so interiors no longer receive ambient lighting
• Tweaked day-night cycle, atmospheric scattering, and ambient lighting
• Render grass material only on the top of grassy dirt bricks
• Added glowing brick material (doesn't affect other bricks yet)
• Prevent brick placement on top of the player
• Optimization of rendering data setup

Keys:
Left Mouse Button: Add a brick of the selected material
Right Mouse Button: Remove a brick
Middle Mouse Button: Select the brick material you're aiming at
Mouse wheel: Change selected brick material
L: Toggle flashlight
F6: Save the game
F7: Load the game
Escape: Exit the game