Attach the 'use it?' field to Text output

[MBartkowiakSTFC]

Description of work
In the MDANSE plotter, we are able to select specific rows or columns in a 2D array. However, the same input field is ignored in the Text "plotter". This PR makes it possible to pick a subset of data in the Text viewer and save it to a CSV file instead of saving all the rows and columns.

Fixes

1. Modify Text plotter to use the curves_vs_axis method.
2. Minor type hint corrections.

To test
Load a 2D dataset and plot it. Select two specific rows or columns using the Use it? field.
Send the same dataset to the Text plotter. Try to show the same rows/columns in the text. (Disable/enable preview to check if that still works correctly.)

[oerc0122]

Looks good if it works. Do we have any tests for the text dumpers?

[ChiCheng45]

Works well. Just one thing. Can we change the first value in the table to be empty instead of zero? Just slightly confusing on first reading.

[MBartkowiakSTFC]

Works well. Just one thing. Can we change the first value in the table to be empty instead of zero? Just slightly confusing on first reading.

What would be a good placeholder to put there instead of a zero? The main reason for it being there is not to end up with the top axis misaligned with the array elements below. This only happens when you import the data into some other software like Origin.

[ChiCheng45]

Works well. Just one thing. Can we change the first value in the table to be empty instead of zero? Just slightly confusing on first reading.

What would be a good placeholder to put there instead of a zero? The main reason for it being there is not to end up with the top axis misaligned with the array elements below. This only happens when you import the data into some other software like Origin.

can it be some non-numeric character like '_'?

[MBartkowiakSTFC]

can it be some non-numeric character like '_'?

I think this is done now.

[ChiCheng45]

Thanks for that. Looks good.