Add marker configuration capabilities

[alexsludds]

For my work with M3202A modules in a 9010 chassis I need to use markers for precise timing of other equipment in the setup. This function allows me to generate marker signals from the trigger port.

[FarBo]

@alexsludds
We had a fix for doc building in the respoitory files, so I merged the master branch to have that fix for this PR. Now the CI passes

[alexsludds]

Awesome! Can we merge this now?

[FarBo]

@alexsludds
We have still an open conversation. in your function, you have 'verbose' argument that you are not using it after your recent change. This should be corrected before any merge :)

[codecov-commenter]

Codecov Report

Merging #99 (77b7cab) into master (238f4f7) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##           master     #99      +/-   ##
=========================================
- Coverage    6.92%   6.92%   -0.01%     
=========================================
  Files          97      97              
  Lines       12261   12264       +3     
=========================================
  Hits          849     849              
- Misses      11412   11415       +3     

Impacted Files	Coverage Δ
...ntrib_drivers/drivers/Keysight/SD_common/SD_AWG.py	0.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 238f4f7...77b7cab. Read the comment docs.