Start implementing XEP-0449: Stickers

[jbruechert]

PR check list:

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

[codecov]

Codecov Report

Base: 68.51% // Head: 68.56% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (fb6ff05) compared to base (9f9d672).
Patch coverage: 75.65% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #490      +/-   ##
==========================================
+ Coverage   68.51%   68.56%   +0.05%     
==========================================
  Files         294      294              
  Lines       25340    25788     +448     
==========================================
+ Hits        17361    17681     +320     
- Misses       7979     8107     +128     

Impacted Files	Coverage Δ
src/base/QXmppMessage.h	100.00% <ø> (ø)
src/base/QXmppPubSubItem.cpp	100.00% <ø> (ø)
src/base/QXmppPubSubItem.h	75.00% <ø> (ø)
src/base/QXmppStickerPackItem.cpp	71.11% <71.11%> (ø)
src/base/QXmppMessage.cpp	97.98% <83.33%> (-0.33%)	⬇️
src/base/QXmppStickerPackItem.h	100.00% <100.00%> (ø)
tests/qxmppmessage/tst_qxmppmessage.cpp	94.89% <100.00%> (+0.06%)	⬆️
tests/qxmpppubsub/tst_qxmpppubsub.cpp	95.07% <100.00%> (+0.21%)	⬆️
src/base/QXmppFutureUtils_p.h	72.41% <0.00%> (-6.84%)	⬇️
src/base/QXmppError.h	0.00% <0.00%> (ø)
... and 17 more

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