Add SendStanzaParams class

[lnjX]

Before opening a pull-request please do:

• [ ] Documentation:
  • [x] Document every new public class and function
  • [x] Add \since QXmpp 1.X to newly added classes and functions
  • [x] Fix any doxygen warnings from your code (see log when building with -DBUILD_DOCUMENTATION=ON)
• [x] When implementing or updating XEPs add it to doc/xep.doc
• [ ] Add unit tests for everything you've changed or added
• [x] On the top level, run clang-format -i src/<edited-file(s)> tests/<edited-file(s)>

[codecov[bot]]

Codecov Report

Merging #428 (31bb4ee) into master (ca5065c) will decrease coverage by 0.02%. The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master     #428      +/-   ##
==========================================
- Coverage   76.09%   76.07%   -0.03%     
==========================================
  Files         234      236       +2     
  Lines       20712    20722      +10     
==========================================
+ Hits        15761    15764       +3     
- Misses       4951     4958       +7     

Impacted Files	Coverage Δ
src/client/QXmppClient.h	93.33% <ø> (ø)
src/client/QXmppSendStanzaParams.cpp	0.00% <0.00%> (ø)
src/client/QXmppSendStanzaParams.h	0.00% <0.00%> (ø)
src/client/QXmppClient.cpp	58.84% <90.90%> (+0.28%)	:arrow_up:
tests/qxmppclient/tst_qxmppclient.cpp	96.29% <100.00%> (ø)
tests/qxmppomemodata/tst_qxmppomemodata.cpp	98.25% <0.00%> (+<0.01%)	:arrow_up:

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