plugin: cleanup UI

...ndroid/app/src/main/java/cx/ring/client/CallActivity.java

...ndroid/app/src/main/java/cx/ring/client/HomeActivity.java

...oid/app/src/main/java/cx/ring/fragments/CallFragment.java

.../app/src/main/java/cx/ring/plugins/PluginPreferences.java

...ndroid/app/src/main/java/cx/ring/plugins/PluginUtils.java

...n/java/cx/ring/plugins/RecyclerPicker/RecyclerPicker.java

...g/plugins/RecyclerPicker/RecyclerPickerLayoutManager.java

.../app/src/main/java/cx/ring/settings/SettingsFragment.java

...ring/settings/pluginssettings/PluginSettingsFragment.java

.../cx/ring/settings/pluginssettings/PluginsListAdapter.java

...settings/pluginssettings/PluginsListSettingsFragment.java

...oid/app/src/main/java/cx/ring/tv/call/TVCallFragment.java

...rc/main/res/drawable/round_settings_backup_restore_24.xml

...-android/app/src/main/res/layout/frag_plugin_settings.xml

...ndroid/app/src/main/res/layout/frag_plugins_list_item.xml

ring-android/app/src/main/res/layout/frag_settings.xml

...roid/app/src/main/res/layout/single_button_preference.xml

ring-android/app/src/main/res/values/strings.xml

ring-android/app/src/main/res/values/strings_preferences.xml

...id/libringclient/src/main/java/cx/ring/call/CallView.java