Photon datacard

[bryates]

This PR updates the datacard maker to handle the new ttgamma process. This is based on the datacard maker from the master branch, so it looks like a lot more changes than there actually are.

[bryates]

This PR is pretty simple, but the CI is failing since we've changed the channels upstream in the analysis processor. I don't think that should hold up this PR, since it's targeting the photon branch. @Andrew42 and @abasnet97 did either of you have comments on this PR?

[abasnet97]

To me, the PR looks good. I think Brent said that the photon related changes were pretty simple and were added on top of pre-exisiting changes made in the master branch (which have been verified to work).

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 24.38%. Comparing base (30b3af4) to head (fb6238d).

Files with missing lines	Patch %	Lines
topeft/modules/datacard_tools.py	50.00%	6 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##           photons_histEFT     #420      +/-   ##
===================================================
+ Coverage            24.36%   24.38%   +0.02%     
===================================================
  Files                   35       35              
  Lines                 5085     5093       +8     
===================================================
+ Hits                  1239     1242       +3     
- Misses                3846     3851       +5     

Flag	Coverage Δ
unittests	24.38% <50.00%> (+0.02%)	⬆️

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