Released 0.9.4

This is a quick release of some rendering performance improvements, but also includes a new experimental system for water drops.

Simulation

• Liquid drops are now created at the edges of liquids, and splash down below
• Liquid vents now emit using liquid drops, rather than emission into the environment

Internal

• Improved performance of all shaders
• Slightly improved performance of asset loading
• Added --vsync and --max-fps=n command line options

Fixes

• Fixed sandbox tools occasionally not being simulated once placed in the world