nharker-core: refactor entry id maps

[tsbonev]

Part of #139. Removed direct entries in articles, closes #140. Redid entry reference ordering, closes #141.

[codecov[bot]]

Codecov Report

Merging #146 into master will decrease coverage by 0.47%. The diff coverage is 88.23%.

@@             Coverage Diff              @@
##             master     #146      +/-   ##
============================================
- Coverage     96.35%   95.88%   -0.48%     
- Complexity      277      288      +11     
============================================
  Files            33       33              
  Lines           934      924      -10     
  Branches         88       87       -1     
============================================
- Hits            900      886      -14     
- Misses            4        8       +4     
  Partials         30       30

Impacted Files	Coverage Δ	Complexity Δ
...tlin/com/tsbonev/nharker/core/ArticleProperties.kt	100% <100%> (ø)	5 <2> (ø)	:arrow_down:
...rc/main/kotlin/com/tsbonev/nharker/core/Article.kt	100% <100%> (ø)	8 <2> (ø)	:arrow_down:
...in/kotlin/com/tsbonev/nharker/core/ArticleLinks.kt	75% <100%> (ø)	8 <1> (ø)	:arrow_down:
.../main/kotlin/com/tsbonev/nharker/core/Catalogue.kt	100% <100%> (ø)	5 <1> (ø)	:arrow_down:
...tsbonev/nharker/adapter/nitrite/NitriteArticles.kt	100% <100%> (+1.06%)	34 <0> (ø)	:arrow_down:
...tsbonev/nharker/server/workflow/ArticleWorkflow.kt	91.48% <71.42%> (-3.37%)	22 <2> (ø)
...bonev/nharker/adapter/nitrite/NitriteCatalogues.kt	97.5% <92.3%> (-0.18%)	27 <0> (ø)
...in/com/tsbonev/nharker/core/OrderedReferenceMap.kt	93.75% <93.75%> (ø)	11 <11> (?)

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