[globalcache] Update the Item type for Contact Closures to "Switch" (o…

…penhab#5721)

* Update the Item type for Contact Closures to Switch

The "Contact" item type cannot actually accept commands, so move it to a Switch. The documentation (https://www.openhab.org/addons/bindings/globalcache/) refers to defining these as both Contact and Switch types, but a Contact type is not very useful if you want to change the state of a relay.

Signed-off-by: Maximilian Hess <mail@ne0h.de>

bundles/org.openhab.binding.globalcache/README.md

@@ -135,7 +135,7 @@ A *Contact Closure channel* activates the contact closure (relay) on the iTach o
 For example, the following item links to the module 1, connector 1 channel on an iTach CC device.
 
 ```
-Contact MyRelay "My Relay [%s]" (gRelays) { channel="globalcache:itachCC:000C1E039BCF:cc-m1#c1" }
+Switch MyRelay "My Relay [%s]" (gRelays) { channel="globalcache:itachCC:000C1E039BCF:cc-m1#c1" }
 ```
 
 The item definition for an iTach Flex WiFi device would look like this.

bundles/org.openhab.binding.globalcache/src/main/resources/ESH-INF/thing/channel-types.xml

@@ -12,7 +12,7 @@
  </channel-type>
 
  <channel-type id="channel-type-cc">
- <item-type>Contact</item-type>
+ <item-type>Switch</item-type>
  <label>Contact Closure</label>
  <description>Transmits contact closure command on module:connector</description>
  </channel-type>