Implement MAC lookup (#68)

* Implement MAC lookup

* Refine error processing

* Use long to store MAC consistently

* Link back to macvendors.co

* Undo some havoc

* Do not show mac spans for TV

* Show MAC and IP in a consistent order

* Add IP spans by ipinfo.io

* Add SpanFormatter

* Fix IPv6 ipinfo.io link

* Refine SpanFormatter

* Fix pressing the link

mobile/src/main/java/be/mygod/vpnhotspot/manage/InterfaceManager.kt

@@ -35,7 +35,7 @@ class InterfaceManager(private val parent: TetheringFragment, val iface: String)
         override val active get() = parent.binder?.isActive(iface) == true
     }
 
-    val addresses = parent.ifaceLookup[iface]?.formatAddresses() ?: ""
+    private val addresses = parent.ifaceLookup[iface]?.formatAddresses() ?: ""
     override val type get() = VIEW_TYPE_INTERFACE
     private val data = Data()