Refactor table cells + precisions / attrTypes / visibilities.

[lublagg]

This PR makes the following changes:

• Moves all of the Nested Table view components into their own folder, and creates sub-folders for the different types of nested views
• Replaces the mapValuesToCells function with a TableCells component and removes the TableCell component (to remain consistent with the plural TableHeaders)
• Replaces the getAttrVisibilities, getAttrPrecisions and getAttrTypes utility functions with views on the Collections model
• Creates a getDisplayValue helper function that will return a cell value with the correct precision / formatting
• The EditableCell component displays the returned value from getDisplayValue, instead of just the raw value

[emcelroy]

Your changes look good, @lublagg 👍 I merged in changes from main after @scytacki helped simplify the setting of focus when a new attribute is added. I also made a few small fixes for bugs unrelated to your changes. Could you please review and make sure things look OK?

Now that I write that out, I realize it would've been better if I had made a separate branch for the bug fixes. The separate commits should allow you view them in isolation, but if it's too confusing, let me know and I'll move them to a new branch.