Script Generator: Improved Keyboard Shortcuts

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# Feature Description
As an instrument scientist, I would like to be able to add text by simply typing in the text boxes, and add rows with keyboard shortcts so that I can more quickly use the script generator.

## Explanation

Requested by EMU instrument scientist. Add any obvious keyboard shortcuts to the script generator, such as ctrl-n for a new line, cut/copy/paste. Additionally make cells editable after a single click.

### Additional Information
Not applicable

# Acceptance Criteria
- Commonly used keyboard shortcuts such as ctrl-n/c/x/v are implemented in the script generator
- A single click on a cell allows a user to type in that cell

# How to Review
_{Before making a PR...}
- _Provide verbose instructions for the reviewer to test your changes_
- _Describe how you have implemented testing for this feature_
- _Provide screenshots of the feature to help the reviewer if relevant_

_{_If not applicable, write "Not applicable"_}

[comment]: <> (FILL IN BELOW)
> ...

_{**To the reviewer: Make sure to [update submodules](https://github.com/ISISComputingGroup/ibex_developers_manual/wiki/Git-workflow#reviewing-work-for-the-submodules-of-epics)!**}

Inizia individuando l’interfaccia utente del generatore di script e i relativi punti di ingresso per la modifica delle celle e la gestione delle righe. Verifica come funziona attualmente la modifica con un singolo clic, quindi verifica manualmente Ctrl-N, Ctrl-C, Ctrl-X e Ctrl-V, insieme alla digitazione dopo un clic; il lavoro è completato quando i criteri di accettazione elencati funzionano in modo coerente nel generatore.

Scritto dal modello di indicizzazione a partire dal testo della issue.