Release 1.21-21.0.1.0:

• Add Oculus warning screen
• Add FBPDripParticle
• Add FBPRainParticle transparency adjustment option
• Particle physics improvements
• Optimize performance, fixes #27, fixes #34
• Add FBPSnowParticle water physics
• Add snowball and slime ball particles
• Update README.md
• Fix shaders incompatibility, fixes #10, fixes #24
• Fix flame particles not spawning while frozen
• Add FBPCampfireSmokeParticle
• Code cleanup & improvements
• Stable release for Minecraft 1.21
• Add block placing animation, closes #11
• Improve FBPTerrainParticle physics
• Fix incorrect lighting of FBPTerrainParticle