Prepare for Elya detector

This is a collaborative pull request to integrate the Elya detector system. These are user parameters:

1. Choice of one out of three cameras.
    - Each camera can be rotated continuously
2. Choice of up to twelve scintillators
    - Each scintillator can be tipped/tilted
3. Two light paths
    - High resolution 
        - 4 lenses (i. e. discrete magnification)
        - Choice of one out of 2 x 6 filters
    - High speed
        - Continuous magnification 
        - Discrete f-number