BitsOfBinaryData: Add fromByteArray() utility function

[lnjX]

It automatically hashes the data and creates a content ID.

PR check list:

• [x] Document your code
• [x] Add \since QXmpp 1.X, QXMPP_EXPORT
• [x] Fix doxygen warnings (see log when building with -DBUILD_DOCUMENTATION=ON)
• [x] Update doc/doap.xml
• [x] Add unit tests
• [x] Format the code: Run clang-format -i src/<edited-file(s)> tests/<edited-file(s)>

[codecov[bot]]

Codecov Report

Merging #462 (2c0e356) into master (50be942) will increase coverage by 0.01%. The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master     #462      +/-   ##
==========================================
+ Coverage   68.63%   68.65%   +0.01%     
==========================================
  Files         275      275              
  Lines       23905    23918      +13     
==========================================
+ Hits        16407    16420      +13     
  Misses       7498     7498              

Impacted Files	Coverage Δ
src/base/QXmppBitsOfBinaryData.h	100.00% <ø> (ø)
...pphttpuploadmanager/tst_qxmpphttpuploadmanager.cpp	67.48% <0.00%> (ø)
tests/util.h	86.27% <ø> (ø)
src/base/QXmppBitsOfBinaryData.cpp	100.00% <100.00%> (ø)
...ts/qxmppbitsofbinaryiq/tst_qxmppbitsofbinaryiq.cpp	100.00% <100.00%> (ø)
tests/qxmppomemodata/tst_qxmppomemodata.cpp	98.25% <0.00%> (+<0.01%)	:arrow_up:

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