This also fixes a display bug that is present with large fader falloff speeds.

Increase Mixer fader falloff speed

This file tells the github online editor to use tabs of width 4 instead
of 8. Open
[this](https://github.com/JohannesLorenz/github_test/blob/master/test.cpp)
test file in your browser to see how it works (the width is 5 in the
example).

Actually, it also tells many other editors...

* MDI Subwindow Decoration for VeSTige instruments closes #2824

* revert changes

* change QMdiSubWindow to our SubWindow in Vestige

* implements drag and drop samples to sampletracks

* clean up / take care of timeLineWidget heigth in songeditor

* unused memeber removed

* clean up

* Update include/TrackContainerView.h

Co-Authored-By: Spekular <Spekular@users.noreply.github.com>

* Update src/gui/TrackContainerView.cpp

Co-Authored-By: Spekular <Spekular@users.noreply.github.com>

* Update src/gui/TrackContainerView.cpp

Co-Authored-By: Spekular <Spekular@users.noreply.github.com>

* Update src/gui/editors/SongEditor.cpp

Co-Authored-By: Spekular <Spekular@users.noreply.github.com>

* load AFP if we don't drop on a sample track

* take care of timeLineWidget size changes

* clean up

* consolidate some code

* requested changes by code review

* move logic to SampleTrackView

* clean up

* clean up

* clean up

[ci skip]

Those are needed for the case when an instrument is being resized
manually.

This is mostly for completeness, it does not fix any known issues.

This does not have any effect, as the surrounding MDI sub window always
uses the minimumSizHint. It's just preparation.

Replace old spectrum analyzer by new one with higher resolution and
many new features.

Resolves #2847.

…name

Fixed renaming mixer channel from the context menu

The EffectRackView in an InstrumentTrackWindow had some parts hidden when
loading files with >= 4 effects. This was now fixed by force-resizing the
EffectRackView to its desired size.

It's a dirty fix, but good enough, plus many Instrument UIs might get
rewritten to be resizable in the future.

* New default behavior: Preserves offsets when moving clips, resizes in fixed increments.

* Adds shift + drag: Snaps move start position (like current behavior) or end position (new),
based on which is closest to the real position. When moving a selection,
the grabbed clip snaps into position and the rest move relative to it.

* Adds alt + drag: Allows fine adjustment of a clip's position or size,
as an alternative to ctrl + drag.

* Adds a Q dropdown in the song editor to allow finer or coarser snapping (8 bars to 1/16th bar)

* Adds a proportional snap toggle. When enabled, snapping size/Q adjusts based on zoom,
and a label appears showing the current snap size. This is disabled by default.

* Use median based logic for controlling loop points.

* Limit controlling loop points to right mouse button.