avm2: TLF improvements, implement TextBlock.recreateTextLine

[Lord-McSweeney]

Description

Improve TLF support:

• Implement invalidating lines of a block when its content changes
• Implement static text lines
• Support TextBlock.recreateTextLine

This gets the Weed to Wonder SWFs working again and should fix the panics caused by the recent TLF regression.

Testing

I've added a new test, avm2/textblock_recreateline.

Checklist

• I, a human, have self-reviewed this PR and fully understand the changes within.
• I have made or updated tests where possible.
• All of my commits are properly scoped, compile successfully, and pass all tests.
• This PR does not make sense to split up into smaller PRs.
• An LLM was involved in the authoring of this code.