Implement Rock Kit samples

[minosimo]

Description

Replaced samples with more typical Rock Kit sound

Samples are from https://ivyaudio.com/freebies

(I am the creator of Ivy Audio, and give permission to use these samples. Will switch Scott Drums to gplv3 license soon)

Relates to #14

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Additional Notes

Let me know what you think of the sound. I'll want to adjust the editing and processing.

[sepehr-rs]

Thanks a lot for your contribution @minosimo. This looks good to me, but I'll request a review from @Revisto too, as he might have some other thoughts about this.

[vanillajonathan]

Note that the about dialog has a mention of where the drumkit is from so update that one.

[Revisto]

Hi @minosimo, thank you so much for implementing your rock kit samples into the drum machine <3

I'm going to keep this PR open till we make a sample kit switcher or something, so we can have multiple kits, such as the current one and the Rock kit you added.
Thanks.

[Revisto]

Well, I changed the default branch to main and removed the master branch, which caused this. Sorry about that. But about this pull request, we are close to having multiple kit samples since we added the custom samples feature. I will reach out to you once we have this feature.

I changed the target branch to main so it should be fixed now and no need to open a new PR, thanks.