Better reload/reset table

[omichel]

This PR tries to make the supervisor reload/reset/etc. table easier to read:
https://cyberbotics.com/doc/reference/supervisor?version=fix-make-table-easier-to-read

[BenjaminDeleze]

I am not totally convinced that the changes improve the readability but they are correct.

[omichel]

I am not totally convinced that the changes improve the readability but they are correct.

If they don't improve readability, we should not merge this PR.

[omichel]

@ygoumaz, @ad-daniel and @stefaniapedrazzi: what do you think?

[ygoumaz]

Maybe centering the text in merged cells may look better, but hard to tell without trying.

[omichel]

Maybe centering the text in merged cells may look better, but hard to tell without trying.

Done.

[ygoumaz]

It is indeed better imo.

[stefaniapedrazzi]

I'm not sure either that the readability is better than before.
I have the feeling that it is even more difficult to understand what is the title of the column by merging all these cells.
I find it easier in the previous version to understand the meaning of the 6 columns.

[stefaniapedrazzi]

If it would be possible to add some borders between columns in the header row, then probably it will be much better.

[omichel]

I just added header columns, vertical centering and colors... Is that better?

[stefaniapedrazzi]

Yes, I think it is better like this.