Add 'engine/' from commit 'a8e37fc010'

git-subtree-dir: engine
git-subtree-mainline: b74841629e
git-subtree-split: a8e37fc010

engine/doc/classes/VisualShaderNodeVectorDistance.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="VisualShaderNodeVectorDistance" inherits="VisualShaderNodeVectorBase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+	<brief_description>
+		Returns the distance between two points. To be used within the visual shader graph.
+	</brief_description>
+	<description>
+		Calculates distance from point represented by vector [code]p0[/code] to vector [code]p1[/code].
+		Translated to [code]distance(p0, p1)[/code] in the shader language.
+	</description>
+	<tutorials>
+	</tutorials>
+</class>