[4.1] Add an iteration lock to prevent cross thread operation #2459
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…me time.
I discovered this during this pull request
#2425
That when SkiaObjects are used in more than one threads exceptions occour. This was the simplest fix to the Skia Crashes. I'll still investigating If I can do without a global Render/Iteration Lock But for the 4.1.2 Branch this should be sufficient to Fix Threading issues.