Bump version to 2.5.16-beta and update fastlane metadata

fastlane/metadata/android/en-US/changelogs/111.txt

+## Fixed
+* Fix selection of HABPanel panel (#1214)
+
+## Added
+* Show shortcut to notification settings for Oreo and above (#1167) 

mobile/build.gradle

@@ -30,8 +30,8 @@ android {
         applicationId "org.openhab.habdroid"
         minSdkVersion 14
         targetSdkVersion 27
-        versionCode 110
-        versionName "2.5.15-beta"
+        versionCode 111
+        versionName "2.5.16-beta"
         multiDexEnabled true
         testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
     }