Citation format fix for non DOI items

[akhuoa]

Features

• Add an option, useDOIFormatter (default is true), to choose between citation.doi.org or citation.js to format citations.
• Style error items with a "reload" button.

• Export get citation method (getCitationById method can be exported)

Related PRs

• Add an option to choose between doi.org and citation.js for citation format map-sidebar#105
• Add an option to choose between citation.js and doi.org for citation format mapintegratedvuer#271

[alan-wu]

@akhuoa I cannot install some of the new citation packages without using npm install --force, can you double check that for me please?

[alan-wu]

@akhuoa Can you separate out the style change for error citation class into its own pull request please? I will hold off approving this pull request as citation.js increased the bundle size from ~1050kb to ~1800kb. Thanks.