Move visual shaders to a module

modules/visual_shader/doc_classes/VisualShaderNodeBooleanConstant.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="VisualShaderNodeBooleanConstant" inherits="VisualShaderNodeConstant" api_type="core" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../doc/class.xsd">
+	<brief_description>
+		A boolean constant to be used within the visual shader graph.
+	</brief_description>
+	<description>
+		Has only one output port and no inputs.
+		Translated to [code skip-lint]bool[/code] in the shader language.
+	</description>
+	<tutorials>
+	</tutorials>
+	<members>
+		<member name="constant" type="bool" setter="set_constant" getter="get_constant" default="false">
+			A boolean constant which represents a state of this node.
+		</member>
+	</members>
+</class>