Improve timer mode tick guessing algorithm accuracy

[csunday95]

Currently, the tick guessing algorithm for the timer mode is consistently off. I think some data should be compiled to reconfigure the linear fit parameters. So that this can be continuously improved, it may be best to make the intercept and slope configurable and saveable in the user frontend.

[csunday95]

@petersn it appears I actually already implemented this and it was merged into the codebase, but v0.0.19 was never pushed to production. Do you think it'd be possible to update the published version to the new code?

[Amphitryon0]

Even with this aspect having been made configurable, there is still a hardcoded 760 per reward, which, according to #3 (comment), is only based on two observations. This should also be recalculated, as well as being made configurable.