'shift' mode for wand editing - on shift-click and drag, moves all spells in the wand

[ashleybaldock]

E.g. wand with spells A, B, C, D, _, _
(+ swap when moving on)

click + drag B to the right: A, C, B, D, _, _

shift-click + drag B to the right: A, _, B, C, D, _

(shortcut for inverse of 'move without swapping' option):
ctrl/cmd click + drag B to the right: A, _, B, D, _

settings:
drag+drop behaviour

• when adding a spell: replace (like the game) OR insert between
• when moving spells around: swap (like the game) OR replace OR insert between
• swap when moving

hover (desktop):
show spell info card

selection:
click on non-selected spell -> deselect all + select clicked + set click1
click on only selected spell -> deselect it
click on one of many selected spells -> deselect others + select clicked + set click1
click + drag on single selected spell -> move/swap spell (insert replace/swap)
click + drag on one of multi-select -> move all (insert between)

range selection (must be contiguous):
shift+click on non-selected spell -> remove previous selection range, add new from click1 to clicked
shift+click on only selected spell -> deselect clicked
shift+click on one of many selected spells -> deselect clicked

not sure what to do about spells that 'fall off' the end of the wand when moving multiples - I guess delete them (undo will still work)

Another option for this, click+drag to select a set of spells, and then drag the selected group around (with either replace or swap behaviour for them on drag end) - probably a better approach on touchscreen devices.