Feature MobilePay transaction integration

[falkecarlsen]

Processing payments as a Treo can be frustrating as you're referencing two lists; payments on stregsystemet and transactions from MobilePay. Sometimes Treos do payments in reverse order, making it harder to figure out which transactions are processed and which are missing. Sometimes multiple Treos are making them concurrently and I unfortunately haven't found a human lock library for Python.

Maybe this can be fully automated for 'correct' MobilePay-comments in the future when the MobilePay Transactions API has been set up. This has also been discussed in #203.
Meanwhile, MobilePay offers functionality to download a CSV containing the same information. This PR adds functionality to upload, parse, and create MobilePayment objects automatically for these transactions along with a utility for processing these transactions, creating ordinary Payments when approved by a Treo.

Thanks @joandrsn for figuring out MobilePay API import 👌

[hrjakobsen]

Expected human lock library. 10/10 disappoint.

[BoAnd]

Small thing. I have not test run the code :'(

[VirtualSatai]

God ide at få dette lavet. @DelusionalLogic og jeg havde tidligere tænkt på at lave det samme, men ifølge daværende formand kunne man ende i problemer hvis ikke der var en person i loop'et. Denne løsning har ikke samme problem, så go for it :)

[DelusionalLogic]

I feel better living in a world where this code is inside the stregsystem.

[asger-weirsoee]

Awesome to have implemented logging, though I think this maybe should've been its own PR, yet all other comments I have are minor things.

Good job, with everything! 👍 :)

[codecov-io]

Codecov Report

Merging #204 (ec96922) into next (3cd9954) will decrease coverage by 0.45%.
The diff coverage is 76.61%.

@@            Coverage Diff             @@
##             next     #204      +/-   ##
==========================================
- Coverage   82.85%   82.39%   -0.46%     
==========================================
  Files          30       30              
  Lines        2006     2244     +238     
  Branches      135      157      +22     
==========================================
+ Hits         1662     1849     +187     
- Misses        321      370      +49     
- Partials       23       25       +2     

Impacted Files	Coverage Δ
stregsystem/urls.py	75.00% <ø> (ø)
stregsystem/views.py	60.95% <10.52%> (-11.62%)	⬇️
stregsystem/forms.py	77.27% <68.75%> (-22.73%)	⬇️
stregsystem/admin.py	73.40% <72.41%> (+1.01%)	⬆️
stregsystem/utils.py	72.61% <81.81%> (+7.91%)	⬆️
stregsystem/models.py	90.62% <88.88%> (+0.74%)	⬆️
stregsystem/tests.py	99.73% <100.00%> (+0.03%)	⬆️
treo/settings.py	97.82% <100.00%> (+0.09%)	⬆️
... and 1 more

---

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 3cd9954...ec96922. Read the comment docs.

[krestenlaust]

VippsMobilepay-fusion's new API might have opened up for automatic matching without having to write information in the comment-feature on transactions. The last 4-digits and legal name of payer is received. #416 Documents implementation of this new API.