Persist time and steps across reboots #2400
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Persist current steps, trip steps and time across reboots with an easily extendable struct for persisting more data in the future.
I've spent a lot of time reading, and I'm pretty sure now that the volatile semantics here are now correct. This means that loading values after reboot should be much more reliable since the compiler is aware that the memory used has special semantics.
Fixes #2293