TTLEditor.java: Added scrolling to debugText.
TTLEditor.java: Moved ifaces Enumeration to member variable.
TTLEditor.java: Added skeleton code for showing per-interface IP addresses.
TTLEditor.java: Minor cleanups, simplifications, errata.
res/layout/activity_ttleditor.xml: Added scrolling to debugText
res/layout/activity_ttleditor.xml: Removed manual interface entry text field and adjusted layout.
res/layout/activity_ttleditor.xml: Added contentDescriptions for TTL entry EditText and interface selection Spinner
res/layout/activity_ttleditor.xml: Declared labelFor entries
res/values/strings.xml: Added string resources for new contentDescriptions
res/values/strings.xml: Removed "default" interface name (used in now-removed manual entry field)