Split Track.cpp and Track.h

[M374LX]

This PR splits Track.cpp and Track.h into one pair of files per class, as suggested in #5592.

[LmmsBot]

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Linux

• Linux (AppImage): lmms-1.3.0-alpha.1.44%2Bg996763e-linux-x86_64.AppImage (build link)

Windows

• Windows 32-bit: lmms-1.3.0-alpha.1.44%2Bg996763e56-mingw-win32.exe (build link)
• Windows 64-bit: lmms-1.3.0-alpha.1.44%2Bg996763e56-mingw-win64.exe (build link)
• Windows 32-bit: lmms-1.3.0-alpha-msvc2017-win32.exe (build link)
• Windows 64-bit: lmms-1.3.0-alpha-msvc2017-win64.exe (build link)

🤖

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[JohannesLorenz]

@M374LX This is just moving code between files, nothing else?

[M374LX]

@JohannesLorenz Other than moving code between files, there are a few changes in includes and forward declarations.

[JohannesLorenz]

Are you able to rebase this branch, so the mentioned conflicts will vanish?

[JohannesLorenz]

Let me know when I should review it.

Also, as you develop more PRs, just as information: We are currently trying to stop writing new PRs, in order to get our already started PRs closed for the reorganizing (#5592).

[M374LX]

@JohannesLorenz It is ready for review.

[JohannesLorenz]

Very useful PR, thanks for your efforts.

I left a lot of comments, but it's almost all about unused includes. Removing them will partly be a bit of work, but it will increase compile time.

[JohannesLorenz]

Only one review comment added about some code comments. Functional it's all OK.

[JohannesLorenz]

LGTM!

[JohannesLorenz]

Thanks for the PR!

I'll wait for CI to finish and then I will "Squash and Merge". If you think it's too early for a merge because you want to add more commits for any reason, scream now 😃

[M374LX]

@JohannesLorenz I believe it is ready to be merged.