New custom seekbar: more improvements

fix value txt being cutted when too long

allow to set a custom string to show instead of the
numeric value when value is defaultValue

res/layout/preference_cherish_seekbar.xml

@@ -30,15 +30,15 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:minWidth="44dp"
-        android:gravity="start|center_vertical"
+        android:gravity="center"
         android:orientation="horizontal"
         android:paddingEnd="12dp"
         android:paddingTop="4dp"
         android:paddingBottom="4dp">
         <TextView
             android:id="@+id/seekBarPrefValue"
-            android:layout_width="24dp"
-            android:layout_height="24dp"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
             android:textAlignment="center"
             android:singleLine="true"
             android:ellipsize="end"

res/values/cherish_attrs.xml

@@ -19,6 +19,7 @@
         <attr name="interval" format="integer" />
         <attr name="min" format="integer" />
         <attr name="units" format="string|reference" />
+        <attr name="defaultText" format="string|reference" />
     </declare-styleable>
 
     <!-- Value to pass to callback when restore button is pressed -->