* GUI: Add marquee 'Text Scroll' option
- Adds the tiny `Text Scroll` option under `MNTM > Interface > General` to either use the standard scroll, or a new marquee style back and forth on any scrollable text.
- `elements_scrollable_text_line_centered` renamed to `elements_scrollable_text_line_ex` to be more general. Has `bool marquee`.
* Unnecessary switch here
* Apply setting internally
* Revert a few usages
* Update changelog
* Last thing
---------
Co-authored-by: Willy-JL <49810075+Willy-JL@users.noreply.github.com>