1. Using the footerPreference component for the interface
android:desription.
2. Remove the redundant and unused codes.
3. Remove the ripple effect for AnimatedImagePreference.
Bug: 142532186
Test: manual test
Change-Id: I547ed7611b40d8b7bee4c4350b00bd4987768950
Goal: 1. let third party developer can use html text that include from their local image file and
animated image instead of only plain text to rich their content.
2. Avoid malicious links made by third party developer
Action: 1. Add html, static text, and animated image preferences.
2. Add android:AnimatedImageDrawable, and android:htmlDescription attributes.
3. Fine-tune interface and integration
4. Add custom tag filter
Bug: 136292241
Test: Maunal & make RunSettingsRoboTests
Change-Id: I82cd5319efb7faa1ff7e8354a279828fce5135b8
