Update B2NOTE integration

[hevp]

Contains following updates:

• Updated B2NOTE widget integration
• Asynchronous B2NOTE annotation count retrieval
• Per file and per record annotation buttons and counts on landing page
• Annotation button moved to bottom of landing page
• Copyable checksum per file
• Icons for every button on landing page

\close #1800 \close #1792 \close #1557 \close #1788 \close #1676 \close #1789 \close #1787

[hjhsalo]

Merged in 5fb17c91a134edf4d8e6d91aa2248092fc13a2ab