Add in close to destructor

[andyb96247]

Small change to add the file API close method call to the data pipeline object destructor. Also, modified the .gitignore to remove the C++ unit test outputs.

Fixes ScottishCovidResponse/SCRCIssueTracking#752

[codecov]

Codecov Report

Merging #109 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #109   +/-   ##
=========================================
  Coverage     76.72%   76.72%           
+ Complexity      181      180    -1     
=========================================
  Files            64       64           
  Lines          2217     2217           
  Branches         38       38           
=========================================
  Hits           1701     1701           
  Misses          484      484           
  Partials         32       32           

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