Add project property to each bib entry

[ChrisTimperley]

Example:

@inproceedings{KinneerDissimilarity2018,
  author    = {Cody Kinneer and
               Sebastian J. I. Herzig},
  title     = {Dissimilarity Measures for Clustering Space Mission Architectures},
  booktitle = {Proceedings of the 21th {ACM/IEEE} International Conference on Model
               Driven Engineering Languages and Systems, {MODELS} 2018, Copenhagen,
               Denmark, October 14-19, 2018},
  pages     = {392--402},
  year      = {2018},
  crossref  = {DBLP:conf/models/2018},
  url       = {http://doi.acm.org/10.1145/3239372.3239390},
  doi       = {10.1145/3239372.3239390},
  timestamp = {Tue, 16 Oct 2018 10:17:16 +0200},
  biburl    = {https://dblp.org/rec/bib/conf/models/KinneerH18},
  bibsource = {dblp computer science bibliography, https://dblp.org},
  project   = {repair, robots, tools}
}

To filter bibliography entries:

{% bibliography -g year --query @*[project~=repair] %}