* Fix world save rename not applying new name
KeyboardCompleteWorldNameCallback had no _WINDOWS64 branch, so the
typed name was validated then silently discarded on every rename attempt.
Write the new name to a worldname.txt sidecar file next to the save
(Windows64\GameHDD\{folder}\worldname.txt) and update the in-memory
display name immediately. ReadLevelNameFromSaveFile now checks for this
sidecar first so renamed saves persist correctly across restarts.
* Fixed gamertag being blank upon renaming and re-joining a save
* Save deletion fix, exiting without saving fix
* Add native in-game keyboard UI for world naming and renaming
Preserve smooth row-by-row scrolling for mouse wheel input, but restore
full-page movement for controller/menu scroll actions in the creative
inventory.
Commit 3093ca3 changed page indexing to support smooth scrolling, which
caused ACTION_MENU_OTHER_STICK_UP/DOWN to advance by one row instead of
one page. Track whether the scroll action originated from the mouse
wheel and only use single-row steps in that case.
Fixes#253