Rename `out_ambisonics.wav` to separate for SMA and EMA

[HaHeho]

I think this would be much more clear for users if they are named out_ema_ambisonics.wav and out_sma_ambisonics.wav.

• [ ] Update render_ema_to_ambisonics.m code
• [ ] Update render_sma_to_ambisonics.m code
• [x] Remove out_ambisonics.wav from repository
• [ ] Add two new rendered files to repository repository
• [ ] Update binaural_rendering.rpp to automatically load the correct files (haven't looked into how the project is setup yet)
• [ ] Update README.md accordingly