Add Tooltip attributes to scripts.

[EikoBiko]

Suggestion:

Unity editor tooltip attributes would be fantastic for general accessibility. A particularly good example of where these might be useful is in the Avatar script; there is currently no explanation in documentation or in the editor for what the head and hair mesh arrays actually do.

[Greased-Scotsman]

There are tooltips on most Avatar script functions and the body/hair/head mesh lists are mentioned in the Usage Info documentation in the inspector, but we will be adding more details, functionality and tooltips to help keep things clear.