MIDI assigns for presets and general effect params and "momentary mode"

[enso-media]

On professional lighting consoles there is the ability to set/overwrite basic and general device or scene features with shortcuts.
Especially in a live situation you often dont want to change the whole scene including all devices, but only make small changes with the beat or react to the current situation that happens on the stage with minor adjustments.

Examples:

• Keep all effects running, but manually change the color/gradient
• Increase/decrease speed of effects
• Reverse/flip effect direction or mirroring

Of course every effect can have its own parameters. But almost all effects in LedFX already have certain options in common (color/gradient, flip, mirror, presets).
So based on a naming convention it should be possible to map those to a MIDI command.

Another improvement would be an option to toggle between latch and momentary mode for MIDI assigns.
It should be possible to change params or scenes only as long as a button is pressed, and fall back to its previous state when the button is released.
Most prominent examples for this (heavily used in any live situation):

• strobe lights
• blinder (specific light-groups or all lights full-on)
• blackout (all off)