nharker-core: add article restoration

[tsbonev]

Added logic to restore an article's entries, properties and links when restoring from the trash. Added verification logic to an entry's explicit links when restoring from the trash. Covers first point of #129.

Added documentation for OrderedMap, ArticleLinks and ArticleProperties, closes #136.

[codecov[bot]]

Codecov Report

Merging #137 into master will decrease coverage by 0.41%. The diff coverage is 88.73%.

@@             Coverage Diff              @@
##             master     #137      +/-   ##
============================================
- Coverage     96.82%   96.41%   -0.42%     
- Complexity      275      280       +5     
============================================
  Files            32       32              
  Lines           914      975      +61     
  Branches         82       93      +11     
============================================
+ Hits            885      940      +55     
+ Misses            5        4       -1     
- Partials         24       31       +7

Impacted Files	Coverage Δ	Complexity Δ
...tlin/com/tsbonev/nharker/core/ArticleProperties.kt	100% <ø> (ø)	5 <0> (ø)	:arrow_down:
...m/tsbonev/nharker/core/helpers/EntityConverters.kt	100% <ø> (ø)	0 <0> (ø)	:arrow_down:
...lin/com/tsbonev/nharker/core/helpers/OrderedMap.kt	94.73% <100%> (+0.98%)	0 <0> (ø)	:arrow_down:
...m/tsbonev/nharker/server/workflow/EntryWorkflow.kt	97.95% <100%> (+0.59%)	11 <1> (+1)	:arrow_up:
...in/kotlin/com/tsbonev/nharker/core/ArticleLinks.kt	75% <75%> (ø)	8 <8> (ø)	:arrow_down:
...tsbonev/nharker/server/workflow/ArticleWorkflow.kt	94.81% <87.5%> (-4.05%)	22 <4> (+4)
...main/kotlin/com/tsbonev/nharker/cqrs/StatusCode.kt	96.36% <0%> (ø)	2% <0%> (ø)	:arrow_down:

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