Custom abstracts

[Integral]

• [x] Examples for executive and web summaries
• [x] Introduce Custom Abstract model
• [x] Importer should use first abstract without abstract-type as main abstract and all others abstracts as custom
• [x] Exporter should export main abstract without abstract-type and all others with it
• [x] Metadata section with abstracts (should show main abstract first and then all custom abstracts)
• [x] Implement CustomAbstractComponent (there you can select abstract type, edit title and abstract)
• [x] Tool for custom abstract insertion
• [x] Contextual tool to remove a custom abstract
• [x] Contextual tools to move up/down a custom abstract

  Tests:

• [x] Inserting
• [x] Editing title
• [x] Switching type
• [x] Removing
• [x] Reordering

[codecov[bot]]

Codecov Report

Merging #1228 into master will increase coverage by 0.25%. The diff coverage is 94.85%.

@@            Coverage Diff             @@
##           master    #1228      +/-   ##
==========================================
+ Coverage   86.78%   87.03%   +0.25%     
==========================================
  Files         400      409       +9     
  Lines        8998     9064      +66     
==========================================
+ Hits         7809     7889      +80     
+ Misses       1189     1175      -14

Impacted Files	Coverage Δ
src/article/shared/ArticleToolbarPackage.js	100% <ø> (ø)	:arrow_up:
src/article/models/Abstract.js	100% <ø> (ø)	:arrow_up:
src/article/metadata/MetadataEditor.js	94.91% <ø> (+1.58%)	:arrow_up:
src/article/shared/InsertFootnoteCommand.js	100% <ø> (ø)	:arrow_up:
src/article/models/Article.js	100% <ø> (ø)	:arrow_up:
src/article/metadata/MetadataModel.js	100% <ø> (ø)	:arrow_up:
...article/metadata/ArticleInformationSectionModel.js	100% <ø> (ø)	:arrow_up:
src/article/models/CustomAbstract.js	100% <100%> (ø)
src/article/metadata/AbstractsSectionModel.js	100% <100%> (ø)
src/article/converter/r2t/internal2jats.js	95.27% <100%> (+0.23%)	:arrow_up:
... and 30 more

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[obuchtala]

This is looking very good! 👍