Refactoring: Move platform specific code files to src/

[ann0see]

Short description of changes

Moves the platform specific code to src/

CHANGELOG: Refactoring: Moved around files to clean up the repository
Context: Fixes an issue?

Related to: #2601

Does this change need documentation? What needs to be documented and how?

No.

Status of this Pull Request

Ready for testing and review.

What is missing until this pull request can be merged?
Testing.. Should either compile or not compile to show if everything is working.

Checklist

• I've verified that this Pull Request follows the general code principles
• I tested my code and it does what I want
• My code follows the style guide
• I waited some time after this Pull Request was opened and all GitHub checks completed without errors.
• I've filled all the content above

[pljones]

On the basis that a clean build for all targets affected works... (Might be worth ensuring that happens...)

[ann0see]

I'd wait until the CI is green and then test the artifacts.

[hoffie]

Yay, thanks. :)

[ann0see]

@hoffie @pljones can one of you please test Android?

[ann0see]

macOS legacy build works as expected and shows the badge. I can NOT run the normal build, as something seems to be wrong with the universal build. It doesn't show up as universal but ARM now?

[ann0see]

iOS also installs and works correctly.

[pljones]

@hoffie @pljones can one of you please test Android?

Downloaded the ZIP, downloaded an unzipper (eventually... why doesn't Android have one?!)... uninstalled Jamulus (as I always forget this wasn't immediate...)... Installed build from ZIP successfully.

[ann0see]

Ok. Great. So I'll merge it.