Desktop Icons Update

Unify all desktop icons on Mac, Win and Linux to fit with the correct, updated brand guidelines here: https://www.blender.org/about/logo/

This is using :

PANTONE 716 C = #EA7600 (RGB 234 118 0)
PANTONE 647 C = #236192 (RGB 35 97 146)

Thanks to Yevgeny Makarov (jenkm) for compiling this icon update.

See T63623

release/freedesktop/icons/scalable/apps/blender.svg

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