WIP: Qudi spectrometer

[alrik-durand]

Description

This PR is a draft PR, the work is not finished yet, we we though it would be good to inform the community of our projects.

We are writing new hardware/interface/logic/GUI to interface spectrometers in Qudi.
Our goal is to develop the necessary tools to get completely rid of usual closed software for the most usual tasks.
We also aim at developing a "user friendly" basic interface to facilitate the alignment and calibration processes that can sometimes be time consuming for the experimentalist.

Our PR adds two distinct interfaces : one for the camera and one for the gratings part.
Hardware and interfaces are nearly completed, the logic and GUI are a work in progress (not ready for review).

Motivation and Context

The current spectrometer modules only respond to very basic needs.
We are using spectrometers quite often in our lab and wanted dedicated modules for the task. Our developments aim a being this general platform with Qudi's principles in mind.
That is why we are opening this PR to tell other people of our plans.

Our day-to-day changes will not be pushed on this branch, as it would probably generate a lot of mail, we will therefore mainly use the "qudi_spectrometer" branch of my repo for now. I will update this branch when things are ready for review if that is ok with you.

How Has This Been Tested?

This is not tested, this is a WIP. A new PR will be opened the day it is ready enough.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• I have documented my changes in the changelog (documentation/changelog.md)
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added/updated for the module the config example in the docstring of the class accordingly.
• I have checked that the change does not contain obvious errors (syntax, indentation, mutable default values).
• I have tested my changes using 'Load all modules' on the default dummy configuration with my changes included.
• All changed Jupyter notebooks have been stripped of their output cells.

[Fellow-baka]

It is nice to hear that spectrometers modules are developed! For a couple of months, I used qudi to control Princeton Instruments cameras and monochromators (i300, sp2300) and some HORIBA spectrometers (FHR1000 and HR640). Please have a look in https://github.com/Fellow-baka/qudi/tree/HFML-spectroscopy