[ #6450 ] Save UV Layout: Overflow Error
This error was caused by excentric UV faces being exported (I'm talking things like 3443870976 as UV coord, in a range of 0..1).
Edges with extreme coordinates are now ignored (for TGA only, they are exported to SVG) and a warning is printed (at most once) to the console.
I chose to still export them to SVG because they don't affect the running time of the script while exporting them to TGA is just insanely long.
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