Information to be requestable from Odin

[dw96]

Copied from "Colour Detector Software Integration v2_1.docx"
What information can be requested from ODIN via http? STFC will include the following in http commands and document how to:
i. Detector status: Ready/Collecting Data
ii. Detector health: All voltages and temperatures are correct (not each value)
iii. Remaining Time: Collection time/frames remaining
iv. Check of collection time: Readback set collection time
v. Check of filename and location: Readback set filename and location
vi. Check frame rate: Readback current frame rate
vii. Check if dark levels: Report when last collected
viii. Check HV bias: Report that HV bias is Off/On (not set value)

[dw96]

TODO:
ii) Ensure adapter's system_health will check all environmental sensors
iii) Verify double progress bars fulfils this criteria?
(complete this post!)

[dw96]

Provisionally implemented with commit e8baf49