Add a list dialog element

this is basically what it should look like... (this is the environment variables list in windows)


it's essentially a combobox but instead of a dropdown it has a fixed width (just a number) and height in terms of number of entries that should fit before getting a scrollbar.
any extra entries should give it a scrollbar and the entries should be selectable using the mouse and navigable using arrow keys
ideally double clicking an entry should call an `onclick` function which is passed the double clicked string but it's ok if not possible since it can be replicated using a button