Cliff hide option, based on touring view

.gitignore

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+*.render.xml
+!hiking.render.xml

hiking.render.xml

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+<renderingStyle name="Hiking" depends="Touring-view_(more-contrast-and-details)" defaultColor="#f1eae4" version="1">
+
+	<renderingProperty attr="hideCliffs" name="Cliffs" description="Hide cliffs"
+		type="boolean" possibleValues="" category="hide"/>
+
+	<order>
+		<switch>
+			<case tag="natural" value="cliff">
+			    <apply_if hideCliffs="true" order="-1"/>
+			</case>
+		</switch>
+	</order>
+
+	<text>
+	</text>
+
+	<point>
+	</point>
+
+	<polygon>
+	</polygon>
+
+	<line>
+	</line>
+</renderingStyle>