iidx, sdvx: SOCD cleaner for knobs and turntables (#497)

## Link to GitHub Issue, if one exists
n/a

## Description of change
Apply SOCD cleaner algorithm to deal with the case where both
counter-clockwise and clockwise buttons are pressed at the same time.

In SDVX, default algorithm is to prefer the most recently pressed
direction. This is better for dealing with slams in rapid succession,
for example, as you don't have to completely let go of one direction to
hit the other now.

In IIDX, default algorithm is neutral (same behavior as before). Using
last or first algorithm results in double scratches which means you'll
likely end up with an excessive poor after hitting a scratch, so neutral
is actually beneficial. Besides, if you are serious about playing on the
keyboard, you should be using `TT +/-` and `TT +/- Alternate`.

## Testing
Tested SDVX 3, EG (old cab), EG valk cab modes, IIDX 24, 27, 33
(tdj/ldj)

src/spice2x/launcher/options.h

@@ -67,6 +67,7 @@ namespace launcher {
             IIDXBIO2FW,
             IIDXTDJMode,
             spice2x_IIDXDigitalTTSensitivity,
+            IIDXDigitalTTSocd,
             spice2x_IIDXLDJForce720p,
             spice2x_IIDXTDJSubSize,
             spice2x_IIDXLEDFontSize,
@@ -84,6 +85,7 @@ namespace launcher {
             SDVXDisableCameras,
             SDVXNativeTouch,
             spice2x_SDVXDigitalKnobSensitivity,
+            SDVXDigitalKnobSocd,
             spice2x_SDVXAsioDriver,
             spice2x_SDVXSubPos,
             spice2x_SDVXSubRedraw,