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Add savepoint/restore functionality - fixes #73

history class wraps a device, and provides the same capabilities to
draw with, but adds a savepoint() method that pushes the last drawn
image onto a stack, and a restore() method that pops the most recent
image from the stack and redraws it.

30 of 30 new or added lines in 2 files covered. (100.0%)

504 of 610 relevant lines covered (82.62%)

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