Add a zoom function to see the head of the character in the wearables editor

by 0xdd8e8b66613cb347cf2460f692894554836f76e9 (PolyMad#76e9)

Summary:

Developing small stuff like earrings or even some detailed glasses that are adherent to skin is a bit difficult because one can't see the head from near.

Abstract:

Add a zoom function so that the head can fill the viewport.

Motivation:

At the moment, the avatar lays full figure in the viewport and a creator can't see how his creation lays on the head.

Specification:

You choose how to implement this, ha!

• Yeah sure!
• Dunno, maybe discuss?
• Nah we don't need all that detail.
• Invalid question/options

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