fix: Fix listbox row animation reliability to be opt-in and frame rate independent

[MrS-ibra]

This PR is a proper reimplementation for listbox entry animations we introduced in #239
The original implementation lived in LobbyUtils.cpp and only worked for specific and sometimes unintended listboxes. This refactor moves all animation logic we introduced into GadgetListBox.cpp where it is available to any listbox in the game, and makes it opt-in via SetListBoxRowAnimMode so only intended listboxes would animate their entry rows.

fixes:

• Animation is now frame rate independent.
• Listboxes that were not intended to animate no longer do so since only listboxes that we opt in would animate now.
• Fixes the issue where rows stopped animating after reopening a listbox because stale animation state from previous sessions was being reused.

Other listboxes can be opted in by calling SetListBoxRowAnimMode at init time