Add "Splashsurf Studio" Blender add-on #617

Job	Run time
Run cargo fmt	9s
Check and build entire workspace	3m 34s
Build splashsurf_lib with no default features	1m 8s
Build splashsurf_lib with all features	3m 32s
Build & test release mode (windows-latest)	8m 20s
Build & test release mode (macos-13)	1s
Build & test release mode (macos-14)	5m 44s
Build & test release mode (ubuntu-24.04-arm)	3m 46s
Build & test release mode (ubuntu-latest)	4m 2s
Publish to crates.io	-1s
	30m 15s

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