Config params should be scientist friendly

[adamkglaser]

We want the config parameters to be done in terms familiar to lightsheet microscopists.

Specifically, we want to think about tuning the camera settings in terms of slit_width where slit_width is the width of the slit (in pixels) that travels across the frame during frame capture.

[Poofjunior]

Done!

Implemented in the dev/classified branch. https://github.com/AllenNeuralDynamics/exa-spim-control/blob/dev/classified/bin/config.toml#L16