Rename TCO and related to Clip

[ryuukumar]

Don't merge yet, still in progress.

This is a part of #5592, an effort to reorganise and rename LMMS files and classes. This is the final version of this PR. Strongly urge to merge this as early as possible after it is marked complete so that there aren't too many merge conflicts to deal with.

I am yet to rename BB -> Pattern and other similar changes as described in the main issue.

Detailed list of renames:

• TrackContentObject, TCO, Tco, tco -> Clip
• TrackContentObjectView, TCOView (and other variables) -> ClipView
• AutomationPattern, AutomationPatternView -> AutomationClip, AutomationClipView
• Pattern -> MidiClip
• BBTCO/BBClip -> PatternClip

[LmmsBot]

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Linux

• Linux (AppImage): lmms-1.3.0-alpha.1.127%2Bg26309a0-linux-x86_64.AppImage (build link)

Windows

• Windows 32-bit: lmms-1.3.0-alpha.1.127%2Bg26309a09c-mingw-win32.exe (build link)
• Windows 64-bit: lmms-1.3.0-alpha.1.127%2Bg26309a09c-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)

macOS

• macOS : lmms-1.3.0-alpha.1.127%2Bg26309a09c-mac10.14.dmg (build link)

🤖

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[ryuukumar]

I have been inactive on this PR for a good few months now, and I don't think that I will be available to work on it until mid next year. It would be wrong of me hold up the reorg, and besides this is probably not up to date with newer changes. So, I am closing this PR to stop stalling the reorg efforts.

Feel free to base off this PR if you want a starting point for a newer renaming PR.

[M374LX]

Superseded by #6226.