Fix interactor style trackball camera mouse wheel event

[Jo-Byr]

Context

InteractorStyleTrackballCamera's mouseWheel to dolly factor formula has 2 issues:

1. It's not symetrical (f(x) != 1/f(-x)) which makes a chain of zoom + dezoom different from a no-op.
2. It prevents dezooming at zoomFactor === 1 (the current formula is 1 - spin / zoomFactor, which returns 0 0 for zoomFactor = 1 and x = 1, which is the value of a mouseWheel dezoom event by default)

Results

The new formula is symetrical and never reaches 0 to always allow zooming and dezooming.

Changes

Replaced the formula dollyFactor = 1 - spin / zoomFactor by dollyFactor = exp(- spin / zoomFactor)

PR and Code Checklist

• semantic-release commit messages
• Run npm run reformat to have correctly formatted code

[daker]

LGTM, i let @finetjul do a final check