Add creatorplatform to determine where a project originated for future use.

[Jan125]

As mentioned in #8103 (comment) , a platform identifier should be added.

KernelType delivers the most agnostic platform info from native Qt, as ProductType would return "Fedora", "OpenSUSE", etc..
If we want to decollate the rest (Android vs. Desktop Linux = "linux", iOS vs. Mac OS X = "darwin"), we'd have to write our own implementation.

[Jan125]

No requests for a namechange have been made.

[rdrpenguin04]

I would personally prefer more information for diagnostic purposes, so I don't see why we wouldn't want to use ProductType. That's just my opinion though; is there a specific reason you wanted to go with the more generic names?

[Jan125]

Because of hopefully platform generic code.
If a project needs to be checked if it came from a linux build, it should be a unified name for that platform, for code to properly handle it. (We're not building for Fedora or Ubuntu etc. specifically anyway.)

I am not opposed to add a second identifier however.

[rubiefawn]

LGTM, just make sure to update any lines you modify so that they conform to our coding conventions.

[rubiefawn]

Tested, can confirm my save file now begins with:

<lmms-project version="31" type="song" creatorplatform="linux" creator="LMMS" creatorversion="1.3.0-alpha.1.908+b69f5a8" creatorplatformtype="cachyos">