Finalize v2.0.0 release

[nicross]

There is a v2.0.0 branch currently in alpha. It has a simplified API and contains quite a few new useful utilities. Examples include:

• syngen.sound replaces syngen.prop and syngen.props with a simpler interface
• syngen.ephemera helps manage memory of objects like noise generators
• Several namespace changes, like syngen.utility becoming syngen.fn and syngen.tool
• Likewise, everything under syngen.audio has been moved down under the syngen global
• syngen.tool.generatorNd and syngen.tool.streamerNd which generate and stream objects in chunks
• Geometric shapes like syngen.tool.plane, syngen.tool.cone, and syngen.tool.sphere

I've been using it for Periphery Synthetic EP, most recently Fishyphus, and plan to use it for new projects moving forward. Therefore, I consider it stable enough to use in production.

However, I haven't found the time to finish documenting the new features. Once complete, it will then become the main branch and only supported release.

Unfortunately there's no ETA for manifesting this intention. The projects keep me very busy!