Proposal: provide a possibility of passing custom zoom factor to renderer (not graphics)

[nicky1038]

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Before this proposal one could pass a custom factor parameter to graphics.scale method BUT calling it directly causes:

• no redendering;
• no raising scale event by renderer;
• no changing of transform.scale.

Of course these actions could be done later in third party code, but in this case it should just repeat the existing renderer.scale method. It's better to allow developers not to do so.