Add tooltip to table cells with content overflow

[mrvisscher]

Enables users to view a table cell's contents by hovering their pointer over the table cell. If there is an overflow in said cell (i.e. the text is wrapped / cut short with a ...) the full text is shown in a tooltip.

• closes #1101

Screenshot of Feature

Notes

• This doesn't apply to headers of tables.
• This will overrule other tooltips set higher in the qt hierarchy, but only if there is an overflow of the table cell in question.

Checklist

• [x] Keep pull requests small so they can be easily reviewed.
• [x] Update the documentation, please follow the numpy style guide
• [ ] Update tests.
• [x] Categorize the PR by setting a good title and adding one of the labels: bug, feature, ui, change, documentation, breaking, ci as they show up in the changelog
• [x] Link this PR to related issues by using closing keywords.
• [x] Request a review from another developer.

[coveralls]

coverage: 50.051% (-0.02%) from 50.066% when pulling 07cd9efeab22a2592fcda805c770e65db62f065f on mrvisscher:table-tooltip into c722b17354ee64399ff8cf53d9064e9d5d1dd8f3 on LCA-ActivityBrowser:master.

[github-actions[bot]]

This issue has been implemented in the new release of Activity Browser 🚀 (version 2.9.3), you can get the new version by updating Activity Browser.

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