MiniABS 1.5: Audiobookshelf icon and purple theme

- Launcher icon from the Audiobookshelf icon pack (art/icon_master_512.png),
  including an xhdpi size
- Notification icon cut out of the same artwork; player icons redrawn in the
  icon's lilac (tools/make_icons.py)
- Purple colour scheme taken from the icon: gradient accent buttons, lilac
  text accents (accent_light), purple-tinted backgrounds
- README: where the icon and colours come from

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

res/layout/row_episode.xml

@@ -27,7 +27,7 @@
             android:layout_width="fill_parent"
             android:layout_height="wrap_content"
             android:textSize="@dimen/text_show"
-            android:textColor="@color/accent"
+            android:textColor="@color/accent_light"
             android:singleLine="true"
             android:ellipsize="end" />