v1.0.0 rc8 SDK 3.2.0 compatibility

This release addresses compatibility with the new VRChat SDK (currently in Open Beta). It also breaks compatibility with older versions, so updating is not recommended until you install the new SDK version.
It also contains some smaller bug fixes.

Installation via Unity Package Manager (git, recommended):

1. In the Unity toolbar, select Window > Package Manager > [+] > Add package from git URL...
2. Paste the following link: https://github.com/BocuD/VRBuildHelper.git?path=/Packages/com.bocud.vrbuildhelper

For now a UnityPackage will also still be provided.

Note: You may need to reinstall the package from the package manager for now, as a new UPM version listing hasn't been set up yet. This will change soon.