ted v. 2.8.4

Some small improvements:

• Cursor position is no longer reset when the file is changed externally
• Added syntax highlighting for the upcoming Python 3.14 template strings (t"foo")
• Fix syntax highlighting for HTML tag names containing - (and also some more unusual but legal characters)
• Better highlighting for Markdown links. Now <https://example.com> and [a](https://example.com?q=(a)) are highlighted correctly.
• Fixed bg-shader setting not being applied
• Removed bg-texture setting (obscure feature, required lots o code to support it).