Re-enable 3DStreet sound effects

[kfarr]

• desktop mode on any street url (such as http://localhost:8080/?#https://streetmix.net/kfarr/12)
• click sound icon to enable audio, hear current street's ambient environment audio
• enter a new street in the URL bar (such as https://streetmix.net/kfarr/45)
• notice the new street audio does not play
• workaround: click on the play button

possible solutions:

• better messaging of current behavior (reset icon to red x when loading new street?)
• create a new component "playme" that autoplays the asset if global sound enable constant is true

[kfarr]

all audio has been disabled in street component

[kfarr]

In this commit e63983a

• removed more audio files from loading via assets.js
• kept them commented to allow for easy uncommenting to re-enable in the future