Include mixer actions in undo history

[avvvvve]

Your idea

Users should be able to undo actions in the mixer (changing sounds, levels, mute/solo states, etc.) if they so choose.

This behavior could be toggled on and off in preferences, which needs a quick design.

Problem to be solved

One pain point is that if you want to preview a different sound in the Mixer, you have to select it. There's currently no way to quickly revert back to the original sound—you have to go back through the context menu tree to find the last sound you chose.

Consider if there will be a large CPU cost to add this.

Additional context

No response