Cataclysm-dda: Horses hum and make other engine noises when attached to a wagon

[pjf]

Describe the bug

Horses make humming noises when used to drive a cart. Other messages also also refer to the horse as an engine ("you hear the engine start up").

Steps To Reproduce

1. Attach a horse to a cart.
2. Drive the cart.
3. Vroom vroom!

Expected behavior

Horses go 'clip-clop' or 'neigh'.

Versions and configuration

• OS: Ubuntu 16.04 LTS
• Game Version: f95875f3eea4403333379d8a6d6e848c9d2ab837 with #32754, #32782 and MSX tiles applied.
• Graphics Version: Tiles
• Mods loaded:

    Dark Days Ahead [dda],
    Filthy Clothing [filthy_morale],
    Alternative Map Key [alt_map_key],
    [DP_MOD] Indicators: REMIX [DP_REMIX_INDICATORS],
    Modular Turrets [modular_turrets],
    Salvaged Robots [Salvaged_Robots],
    Sleep Deprivation [sleepdeprivation],
    Bionic Slots [cbm_slots],
    sees-player icon, -attitude [sees_player_less_attitude]

[EddiTheBambi]

https://www.youtube.com/watch?v=cJ5WN3yyEHc

I am an engine HURRRR DURRRRR

Worth noting: pretty sure yoke_harness, being the engine, is the source of those sounds and not the horse.

[pjf]

Well dang, clearly I didn't know this behaviour is 100% realistic for horses.

[Inglonias]

I think we should close this without fixing it because it's really damn funny.

[l29ah]

Seems fixed now.

[l29ah]

I take it back: horses do hum, but only when you "start the engine", "let go of controls" and stand near them.