Rename RenderTexture => RenderToTexture

[talkingtab]

Naive and less intelligent users (like myself) could take "renderTexture" to be about something that renders a texture. So when looking for something that renders TO a texture I did not even bother with this as it seemed not to be useful. I understand this is a less than crucial change, but even duplicating or adding a place holder would be great!

R3D,R3F& 3JS are great!