This adds the entity's velocity as an argument when mapping the
movement state to an SFX event, and prevents the run SFX from being
returned if the velocity is below a threshold.
This will prevent hearing the run sfx when stuck in a corner, or running
into a surface where the character is not actually moving their feet.
Implements a potential structure for splitting the SFX event mapping
into smaller individual files for maintainability.
- Remove inventory events for now: For a later commit.
- No longer panic when there is a failure parsing the sfx file: log the error and not play sfx.
