new table view cell type capable of displaying a multi-line text label
improve text & add disclosure indicator to "Inconsistent territory" user preference (#179)

the changes require that the text label is displayed on two lines,
therefore use the new table view cell type VariableHeightCellType
fix crash on startup when trying to delete Inbox folder (fixes #184)
cleanup on „Settings“ tab (closes #179)

change details
- remove useless footer titles for the „Advanced Settings“ entries on
  the „Edit profile“ screen
- add footer titles to the „Find dead stones“, „Mark dead stones
  intelligently“ and the „Inconsistent territory markup style“ entries
  on the „Scoring settings“ screen
- update footer title for the „Player influence“ entry on the
  „Display settings“ screen
- the „Add new player“ and „Add new profile“ entries are now always
  visible on the „Players & Profiles“ screen
- display different footer titles when in normal / editing mode on the
  „Players & Profiles“ screen