Record and playback edit actions

Frogmod has this awesome feature where you can record yourself building an object, let's say a car.

It will save all the actions that were done on that object, every cube push and texture change. This is all saved in a rec file, it's just a plaintext file with very simple contents(probably just a protocol dump).

These files can later be played back and the object that was recorded is reconstructed.

I was able to use this rec feature in frogmod to generate a maze externally(with a C program) then play it back inside sauer and I had the maze constructed in front of me in 1 minute.