Support data buffers in tables (same as plots)

The feature, that plots have the data class as the origin of the data to be shown is very nice.
This is unfortunately not implemented for wave-tables (ui.table).
Currently, one is forced to completely fill all rows of a table, even if only one value is changing.
This breaks the comfort learned from using the plot-class.

Start with the ui.table API and compare its current data handling with the plot class and its data buffers. Determine the table behavior needed for changing individual values without refilling every row, then verify that partial updates work as described.

Written by the indexing model from the issue text.