Improve formatting of numbers on plot Y axis

[emilk]

What

The formatting up numbers on the plot Y axis was really bad before, showing very few digits of precision, and switching to scientific mode really early.

Now it use up to 15 digits of precision and uses thousands separators for clairy.

Sequence timelines (frames, log_tick, etc) are now also formatted with thousands separators to make them easier to read when large.

Before

After

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[abey79]

nice