Add Background music

[networkfusion]

Description

Adds basic BGM. Help is required to refine it.

Motivation and Context

It is nice to have some background music.

How Has This Been Tested?

Screenshots

Types of changes

• Improvement (non-breaking change that adds a new feature)
• Bug fix (fixes an issue)
• Breaking change (breaking change)
• Config and build (change in the configuration and build system, has no impact on code or features)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

Signed-off-by: GITHUB_USER <GITHUB_USER_EMAIL>

[Polprzewodnikowy]

I'm hesitant to allow playing MP3 files outside of the player screen. minimp3 unfortunately has rather big load on the CPU and browsing files would be rather choppy. Maybe someday if we have MP3 decoding done on the RSP then it would be a viable option.

[networkfusion]

I'm hesitant to allow playing MP3 files outside of the player screen. minimp3 unfortunately has rather big load on the CPU and browsing files would be rather choppy. Maybe someday if we have MP3 decoding done on the RSP then it would be a viable option.

In that case, I will close this PR for now. We could implement action sounds and would be nice to have some "out the box" BGM, but that is for a feature request.

Thanks for the input.

[Polprzewodnikowy]

We can easily add files in the dragonfs so adding action sounds should be very easy with libdragon tooling available now. Only problem (at least for me) is sourcing sound effects with permissible license. Or just make some myself.

[networkfusion]

We can (and should) ask for someone to contribute that on the brew discord!