Add ValueNode "Vector Length" for calculating the length of a vector.
-rw-r--r-- 3741 .gitignore
-rw-r--r-- 1453 .valgrind
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drwxr-xr-x - autobuild
drwxr-xr-x - gtkmm-osx
drwxr-xr-x - synfig-core
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