zoom resolution of 1, not 10

[ctzsnooze]

Quick little PR that changes the zoom (time scaling) steps to be units of 1, rather than 10, with a minimum of 10.

Currently a minimum of 10 allows a maximum of 10s of data in a screen. Minimum of 1 allows up to 100s of data, which is a bit long to be useful, but does give a broad overview of a flight.

Steps of 1 allow zooming to whatever amount you like. With a fast computer this can be done very smoothly, although with a lot of data scrolling is a bit slow.

The downside is that the zoom isn't in neat steps of 10 any more.

It might be nice to have a 'preference' for the size of step, and minimum value, but I don't know how to code that.

I personally find this very useful.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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1.2% Duplication

[blckmn]

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