Pioneer DDJ-400: Merge 2.2 branch and fix some eslint issues

…HIFT+JOGWHEEL

Map SHIFT+PLAY to reverseroll - Reverse playback in Slip Mode while held (Censor)

…on, using script.samplerRegEx here results in an error under Linux

when mapped directly in the xml, the on-screen slider behavior is inverted from the physical slider behavior
i.e. moving the physical slider UP results in the on-screen slider moving DOWN
the functions PioneerDDJ400.tempoSliderMSB and PioneerDDJ400.tempoSliderLSB were adapted from the Pioneer-DDJ-SB2-script.js mapping file

    * Level/Depth knob: metaknob of focused effect; if no effect is focused, controls the mix knob for effect unit 1
    * Beat `<`: focus effect 1
    * Beat `>`: focus effect 2
    * FX select button: focus effect 3
    * On/Off button: enable/disable focused effect
    * 1/2/Master switch: assign effect unit 1 to deck 1/2/master as labeled
Unfocus by pressing the button for the focused effect again (so if effect 1 is focused, press Beat `<` to unfocus and make the knob control the mix knob of the unit).
Removed hard-coding of handing of Effect Unit 1 and Effect Unit 2 to apply to Decks 1 and 2 respectively - now only Effect Unit 1 is controlled, and its application to decks depends on the 1/2/Master switch
Added focus indicators to Effect Unit 1 - removed focus indicators from Effect Unit 3
Also added controller polling to Init function

…eck (and also at startup)

…when a sample is playing (even if Shift is currently pressed). Ensure that sampler pad LED remains lit when sample ends or is stopped, even when Shift is currently pressed.

Implements changes to effect unit handling as requested by @Be-ing

Ddj400

… whitespace. Replace engine.connectControl with engine.makeConnection. Removed lines which overrode user preferences for rateRange. Removed unnecessary setting of show_focus to 0. Replaced use of "const" with "var".

Set highspeedScale to 20, to allow quick search through track using S…

Ddj400

Pressing shift + pad 8 increases the jump on all other buttons by a factor of 16
(up to a maximum of 128 beats backwards & forwards on buttons 7 & 8 respectively).

Pressing shift + pad 7 decreases the jump on all other buttons by a factor of 16
(down to a minimum of 1/16 beats backwards & forwards on buttons 1 & 2 respectively).

See discussion: https://github.com/mixxxdj/mixxx/pull/2403/files#r399909449

In the same way as rekordbox, the lights are turned on at startup.

They blink if a loop is active. And the light corresponding to loop in
or out adjust blinks in isolation during loop adjust mode.

- Uses function expressions assigned to the PioneerDDJ object over function declarations
- Improves the sampler load/eject play/cue_gotoandstop logic

…bject

Moves some code around so that the mapping read from top to bottom
almost matches the controls mapped in sequence from left to right.

Uses the knob for wet/dry mix when an effect is enabled and for
the effect's metaknob when the effect is disabled.

Previously this was the other way around.

- Keyboard mode
- Pad FX1
- Keyshift mode

The main script now reads top to bottom so that functions map to the
controller in order (starting at the mixer, then moving through controls
in the deck in a left-right, top to bottom sequence)

…nc lock) on long press)

…ng/decreasing

- Removes getters & setters with side effects
- Uses callbacks to keep the FX light in sync when changes
  are made through the UI

Co-authored-by: Be <be.0@gmx.com>

Relies solely on <outputs> for lighting up the required pads in
beatjump mode.

This removes the need to track the controllers padmode in the script.

This is desirable, because the controller tracks the padmode in its
firmware and seems to be susceptible to benign but unexpected
behavior when that process is interfered with (e.g., manually
resetting the padmode lights sometimes prevents the next pad mode
from being enabled until a sequence of other buttons are pressed).