* Instruments: Reorganize the "Insert new sound
  object" / "New audio instrument" menu.
* Playlist: Give keyboard focus to the sequencer
  instead of the editor when the mouse is inside the
  playlist.
* Sequencer: Minimize sequencer height when
  maximizing window or showing full-screen.
* GUI: Try to fix sequencer sometimes not being
  fully minimized right after startup.
* Windows: Partially fix importing MIDI files, i.e.
  smaller files are imported perfectly now. However,
  larger MIDI files seems to only be partially
  imported on Windows. The problem does not seem to
  be present on Linux and macOS.
* GUI: When showing sequencer, make sure the mixer
  is visible first if sequencer is inside the mixer.
* GUI: Fix keyboard focus when showing sequencer.
* GUI: Don't show mixer at program startup.
* MIDI: Give more information when warning about
  possibly creating a recursive connection when
  connecting an instrument to a MIDI output port.
  Before it could look like the program was stuck in
  an infinite loop when importing MIDI files.
* Sequencer: Clean up popup menus a little bit.
* Mixer strips: Clean up popup menus a little bit.
* Sequencer: Make sure first seqtrack is the current
  seqtrack after loading an older song. Before this
  commit, a hidden seqtrack bus was set as the
  current seqtrack.
* Modular mixer: Let the "C2" button apply to all
  buses, not just the 5 effect buses.
* Instrument effect popup menu: Replace the
  "keybindings for.." sub menu with entries that
  actually changes the value. This value can instead
  be right-clicked to change keybinding. Redundant
  functionality though, but it looks cleaner.
* Modular mixer: Include "mixer" elements in a
  "mixer" sub menu for the popup menu.
* Modular mixer: Snap connections to modules when
  being created.
* Modular mixer: Put connection lines on top of all
  other graphical elements when being created.
* Modular mixer: Fix hovered connection color (it
  was hardcoded to a bluish color).
* Mixer: Make event connections red. (The old color
  looked too much like the audio connection color,
  and yellow (used before that again) looks too much
  like white which is used to show a current event
  going through the connection.)
* Modular mixer: Fix possible division by zero
  sometimes happening when using middle button to
  drag.
* Modular mixer: Redesign GUI of the modules:
  * Don't overlap volume sliders with the
    mute/solo/bypass buttons.
  * Modular mixer: Switch back to displaying simple
    peaks.
  * Modular mixer: Use the instrument color for the
    background color of the M/S/B buttons.
  * Modular mixer: Use black background color for
    the volume sliders.
  * Modular mixer: Write dB value inside the volume
    sliders.
  * Swap upper and bottom half of the modules. I.e.
    paint text and note indicator above slider and
    buttons.
  * Less rounded and a little bit thinner borders.
  * Limit the volume sliders between -40dB and +6dB.
    Before, it was between -40dB and +35dB, which is
    usually a too big range.
  * Make non-linear scaling between effect value and
    slider positions, similarly to the mapping in
    the mixer strips. (i.e. we have approximately
    equal room between -6dB and 6dB and between -35dB
    and -6dB now).
  * Adjust audio port colors.
  * Light up elements below the mouse pointer.
  * Don't draw audio input/output ports when they're
    not used, not visible, or doesn't exist.
  * Alternatively move module by left-dragging the
    name instead of using the right-button.
  * When right-clicking the volume slider, mute,
    solo, or bypass, show the instrument effect
    popup menu instead of the module popup menu.
* Manual: Document the FX/Velocity subtrack.
* Manual: Some minor improvements here and there.
* Help: Open help windows in external browser if the
  built-in browser is not able to show the manual
  (i.e. compiled against a too old version of
  qtwebkit).
* API:
  * Renamed: instrumentIsSeqtrackBus -> instrumentIsBus
  * New: gui_webCanShowManual, getInstruments, getMidiInstruments, getAudioInstruments, getBuses