Add 'engine/' from commit 'a8e37fc010'

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

engine/doc/classes/VisualShaderNodeColorConstant.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="VisualShaderNodeColorConstant" inherits="VisualShaderNodeConstant" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+	<brief_description>
+		A [Color] constant to be used within the visual shader graph.
+	</brief_description>
+	<description>
+		Has two output ports representing RGB and alpha channels of [Color].
+		Translated to [code]vec3 rgb[/code] and [code]float alpha[/code] in the shader language.
+	</description>
+	<tutorials>
+	</tutorials>
+	<members>
+		<member name="constant" type="Color" setter="set_constant" getter="get_constant" default="Color(1, 1, 1, 1)">
+			A [Color] constant which represents a state of this node.
+		</member>
+	</members>
+</class>