use reverse domain name for package name (and asmdef)

[TayouVR]

According to official documentation, It's recommended to use reverse domain name for package name.
This is mandatory for OpenUPM publishing

vcc.docs.vrchat.com/guides/convert-unitypackage/#package-maker-tool

The standard practice for is reverse domain notation like com.vrchat.packagename, using a domain you own.

Most other projects use some from of reverse domain name, <user>.github.io is regarded to be owned by the github user so I think we should use io.github.rurre as prefix.

See also: https://docs.unity3d.com/2019.4/Documentation/Manual/cus-naming.html

[rurre]

Will do in the next update later today. Thanks!