COO-175 Updates to detector config structure, more support for full focal plane image creation and new DEIMOS detector config

[Yashvi-Sharma]

Major changes:

• Modified detector config focal plane params to handle flipping and rotating, updated FocalPlaneImage accordingly
• Added new DEIMOS science detector config (final format, 8 FITS files one per detector)
• Updated archon output DEIMOS config (one file, all detectors in one extension)
• Added better logic to slice constructors to handle more cases
• Added custom file loader for DEIMOS

Housekeeping changes:

• Cleaned up imports
• Cleaned up comments in example YAMLs and docstrings

[prkrtg]

Long term thinking - but most likely we'll need another location for these configurations that are specific to projects. Not sure if having it in the main repo that everyone has to checkout is good

[Yashvi-Sharma]

Yes agree. The configs are not required to be in there by default, people can load them from any local path. The ones in there currently are for examples and demos. Eventually if people want to store a template config for instruments to make it available to everyone, it can live in there.

[prkrtg]

Are there tests outside of the notebooks?

[Yashvi-Sharma]

Yes, I have written some but not committed them yet, will do that next