MODS Environment Flag

[slactjohnson]

The laser group would like to be able to access the MODS devices in laspython. It would be best if the devices were only available for one MODS at a time, e.g. the IP1 MODS, or the IP2 MODS, but not both in one session, to avoid confusion and accidental modification of the wrong system.

These devices have been implemented in the happi database as their own "beamline" for lucid screen generation, but this can also help separate the devices for use in laspython.

It would be good to be able to load just the "common" las devices with a standard laspython call, but then also allow for loading a selected mods with a command line flag.

[slactjohnson]

Temporarily dealt with via #4

Set up an issue in hutch-python repo