Fast follow-ups to destination PR

[pokey]

• Rework Talon side to use destinations #1440
• Don't show warning for "past end of" #1351
• Make return types of actions strong #1612
• More simplification for BringMoveSwap #1608
• Switch "change" implementation to use editNew #773
• Support destination pseudo-scopes #1631
• user documentation does not explain {before, after, start of, end of} target modifiers #1522
• "Chuck" should work with position when it is part of a range #741
• Try to shrink Destination interface #1615
• Revisit action.getFinalStages #1619
• Deduplicate destinations #1621
• Make "bring air to end of this" and "bring air after this" consistent #1628
• Leave comment on Rework command object to support more complex commands and cursorless-style functionality david-tejada/rango#136 with new shape