Fix some addon.xml issues (#14261)

* Fix some addon.xml issues
* Re-add thing-type binding for Velux
* Prefix thing-type filenames

Signed-off-by: Jacob Laursen <jacob-github@vindvejr.dk>

bundles/org.openhab.binding.velux/src/main/resources/OH-INF/thing/thing-type-binding.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Velux Binding -->
+<thing:thing-descriptions bindingId="velux"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:thing="https://openhab.org/schemas/thing-description/v1.0.0"
+	xsi:schemaLocation="https://openhab.org/schemas/thing-description/v1.0.0 https://openhab.org/schemas/thing-description-1.0.0.xsd">
+	<!-- -->
+	<!-- Velux binding Binding -->
+	<!-- -->
+	<thing-type id="binding">
+		<label>@text/thing-type.velux.binding.label</label>
+		<description>@text/thing-type.velux.binding.description</description>
+		<category>NetworkAppliance</category>
+		<channels>
+			<channel id="information" typeId="information"/>
+		</channels>
+		<properties>
+			<property name="bundleVersion">N/A</property>
+		</properties>
+		<representation-property>bundleVersion</representation-property>
+	</thing-type>
+</thing:thing-descriptions>