[TF] show user ID / DC ID in profile info

Display-only port of Nekogram's profile ID/DC line: a third line
under the avatar info showing "ID: <id>, DC: <dc>" (or "<date>, DC:
<dc>" when the avatar is pulled open). Long-press copies the ID
to the clipboard and shows a bulletin.

- Add tw/nekomimi/nekogram/SimpleTextViewSwitcher helper (a
  ViewSwitcher whose children are SimpleTextView, with a
  setText(CharSequence, boolean) for animated updates).
- Wire an idTextView into ProfileActivity's avatar container with
  long-press-to-copy, and keep it in sync via updateIdText(...)
  across page selection, photo deletion, chatInfo load and the
  pulled-down / pulled-up states.
- Integrate idTextView into the existing avatar collapse/expand,
  scroll, color-blending and search-mode transitions so the new
  line animates alongside the online subtitle.

Author: Kartatz