Cross-Browser Cursor Placement Optimization Plugin

[abelpz]

This PR introduces a comprehensive overhaul of the CursorHandler plugin. By generating invisible cursor placeholders, the plugin enables users to accurately position their cursor anywhere within a document, regardless of browser compatibility. This resolves longstanding issues such as the inability to place the cursor inside empty elements. Additionally, the plugin ensures efficient resource management by automatically removing unnecessary placeholders when they are no longer required.

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[abelpz]

Wow, there is a lot of clever work here.

I noticed while manually testing with the left and right arrow keys that there are more spaces than I expect. Also when clicking around, there are places I can't click on but can get to with arrow keys. We could talk about this when we meet next week.

Having said that, this is still a huge improvement than without it so you could still choose to merge it and fix up corner cases later.

Thanks, I made the requested changes and will proceed to merge then.