add Sound Loading/Manager [2]

[benrobby]

Story

As a swa student I want to have an easy way to load Sounds from my pc. I don't want sound to be loaded multiple times.

Description

1. Why: Sound loading is very common and many SWA students had issues with the squeak sound player

2. What:

   • [x] Loading sounds into the squeak image
   • [x] Being able to give a relative/absolute path from which the sounds are chosen (just like image loader)
   • [x] give sound a name and address it by the name
   • [x] method to flush cache
   • [x] throw error if sound doesn't exist

3. Done: Checklist complete

[benrobby]

estimation: 2

[ekrebs5]

accepted