Generate friendly names for touch gestures and allow them to be localizable, when shown in the Input Gestures Dialog etc.
Specifically:
* touchTracker.py: add an action_hold constant which although never needed by touchTrackers themselves, is needed by TouchInputGesture.
* touchTracker.py: lowercase all the values of the action_* constants so that they can be looked up in dictionaries easier.
* touchTracker.py: add an actionLabels dictionary which contains a mapping from action_* constants to friendly localizable action names.
* touchHandler: add a touchModeLabels dictionary which maps from available touch modes to localizable mode names.
* touchHandler.TouchInputGesture: add a pluralActionLabels dictionary which maps from counting words (double, tripple... ) to friendly localizable template labels which have a variable action.
* touchHandler.TouchInputGesture: add a multiFingerActionLabel string which is a localizable template label that has a variable action, for multi fingered actions.
* touchHandler.TouchInputGesture: implement the getDisplayTextforIdentifier method.