v0.70 doesn't read very old machine files correctly.

I noticed this with my Plane Vanilla machine, which I built in v0.01. If you try to load it in the new v0.70, it shows up with the flying spirals and grabber missing. I tried it with other machines I built in v0.01, and the pattern seems to be that blocks with buttons mapped to them are omitted.

This doesn't seem to affect machines built after the slight change in file layout at around v0.05. Strangely, if you first load a machine built after that, but before the move to xml files in v0.25, then you can load the machine built in v0.01 and it shows up in its entirety.

Here's my v0.01 plane so you can experiment:

I updated the plane to a v0.05 save on Steam:
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