Add support for relative midi knob bindings When enabled takes the delta of the knob movement and increases/decreases the assigned convar instead of mapping it in a 0-1 range The minimum value of the binding is used as the speed multiplier Can be enabled when adding a binding by adding true to the end of the binding (eg."midiconvar.bindknob 1 1 graphics.dof_focus_dist 0.1 0 true") Will only work on float convars