Update the UI for the scanner fragment

• Add a modal message for 0 devices showing
• Show the state of the connection next to every device

New 'scanning' screen, which shows when 0 devices are seen:

Status indicators for each device:

(either 'NOT BONDED', 'BONDING...' or 'BONDED', The lattermost is bold and has green text)

CC @Anon: @rahix wants this merged :)

app/src/main/java/de/ccc/events/badge/card10/scanner/Device.kt

@@ -20,11 +20,11 @@
  * SOFTWARE.
  */
 
-package de.ccc.events.badge.card10.scanner;
+package de.ccc.events.badge.card10.scanner
 
 import java.util.*
 
-data class Device(val btMac: String, val name: String?, val paired: Boolean) {
+data class Device(val btMac: String, val name: String?, val state: Int) {
     override fun equals(other: Any?): Boolean{
         if (this === other) return true
         if (other?.javaClass != javaClass) return false
@@ -34,7 +34,7 @@ data class Device(val btMac: String, val name: String?, val paired: Boolean) {
         return true
     }
 
-    override fun hashCode(): Int{
+    override fun hashCode(): Int {
         return Objects.hashCode(btMac)
     }
 }