A lot of changes, see the commit content for details

[drakeet]

• Changed items, adapter, slogan, version fields of AbsAboutActivity to be private, and only get them from public items(), adapter(), sloganTextView(), versionTextView()
• Removed action from Card, if you need the action button, consider to extend the Card and CardViewBinder
• Changed all of ItemViewBinders and its ViewHolders to be public and extendable
• Removed AbsAboutActivity#onCreateTitle()
• Renamed AbsAboutActivity#setHeaderContentColor(int color) to setHeaderTextColor(int color)

[drakeet]

TODO:

• [ ] Support DayNight theme
• [ ] Frined Link Item

[drakeet]