Add Station.close_all_registered_instruments

[Dominik-Vogel]

Add a method to the Station that closes all instruments that have been registered as a component to the Station.
Open questions:

• should Instruments also be removed from the station?

[astafan8]

should Instruments also be removed from the station?

as per our offline discussion, yes :)

[codecov]

Codecov Report

Merging #1713 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1713      +/-   ##
==========================================
+ Coverage   67.32%   67.33%   +<.01%     
==========================================
  Files         146      146              
  Lines       18073    18078       +5     
==========================================
+ Hits        12167    12172       +5     
  Misses       5906     5906

[jenshnielsen]

Is this still true?

[spxtr]

Out of curiosity, why do inst = v and then inst.close() rather than just v.close()?

[astafan8]

this is a style thing. "v" is just a value from a dictionary of components, hence it can be an instrument but also something else. after the isinstance part, the "v" is clarified to be an "inst" instrument, and this is expressed via defining a new variable because closing an instrument is a valid operation, while closing "a component" may not be valid because not all station components are expected to support the "close" method.