add method to StringHelper to write an exception
added methods to UiaDll to add and remove an item from a selection
make fruits listbox a multi-select
items can be added to a selection by index or value
Added SelectList_Selections for mult-select
added SelectList#values to return for multi-select controls
items can be removed from a selection by index or value
cleaned up select_list_spec
add empty state assertion for SelectList#values
update History
assertions for #add and #remove to make sure they through with bad indexes