Editor tools operating on full tables of data, not just the first element

Now that we have moved from singleton to table graphical data, we need to update the tools (and any other internal editor code) which relies upon editing just the first row (which is how we refactored it from singleton data).

The Select tool should show the Transform cage around all table elements. If the user double-clicks, it then filters down to the one table element (and shift-clicking lets you multi-select them).

The Path tool should basically work the same way, also.

We can figure out if any other tools require similar treatment after implementing those first two.