[FEATURE] Make `addText` remove unsupported Unicode characters

[AndreasNasman]

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• If you are not using the latest release, please update and see if the issue is resolved before submitting an issue
• General questions or high-level topics should be posted in Discussions
• Please browse the online Documentation to see if your question is already addressed there

Issue Category

• [x] Enhancement
• [ ] Bug
• [ ] Question
• [ ] Documentation gap/issue

Product Versions

• Please specify what version of the library you are using......: 3.11.0
• Please specify what version(s) of PowerPoint you are targeting: Microsoft® PowerPoint® for Microsoft 365 MSO (Version 2303 Build 16.0.16227.20202) 64-bit
• Please specify what web browser you are using.................: Microsoft Edge

Desired Behavior

It would be great if slide.addText removed or replaced unsupported Unicode characters in Powerpoint. This functionality could be enabled by default or a separate option to enable it could be implemented. A warning that unsupported Unicode characters were found in the added text would also be helpful.

For example, adding text containing a line tabulation character results in a broken PPT document.

import PptxGenJS from 'pptxgenjs';

const presentation = new PptxGenJS();
const slide = presentation.addSlide();

// Adding text containing a line tabulation character (\v) produces a broken PPT document.
slide.addText('Hello\vWorld!');
slide.addText([{ text: 'Hello\vWorld!' }]);

presentation.writeFile({ fileName: 'Sample Presentation.pptx' });