[Table Viewer] Placeholder for improvements

[scottdover]

Describe the solution you'd like
This is a placeholder for general dataviewer improvements. Here's a list of all the things I'll be researching and maybe implementing as part of this:

• Overflow menus for column headers
• Click to sort headers
• Filtering and sorting of data
• Display of # columns/rows
• Context menus for cells to copy data/etc

[phytomosaic]

Users may also wish to alter font size and cell color. Thank you for your great work on this, every improvement you make increases uptake.

[snlwih]

Have split this out in specific smaller feature requests:

1. Table Viewer - support AutoFit and user-defined column-width and row-height  #788
2. Table Viewer - support changing column order for multiple columns in one go #791
3. Table Viewer - Support filters #916
4. Table Viewer - Support sorting columns #1318