Refax: improve logging and code readability around specific logging

[ethouris]

Changes:

1. Added formatting function for numbers used in CPacket::pack logging to make log information clearer.
2. Put whole contents (previously too finegrained) of packet.cpp file under srt namespace
3. In queue.cpp, shipped off the highrate logging facility to a separate function and simplified macro in order to improve readability of the CSndQueue::worker function.

[codecov-commenter]

Codecov Report

Merging #2511 (8ca63b1) into master (53735e1) will increase coverage by 0.00%.
The diff coverage is 39.21%.

@@           Coverage Diff           @@
##           master    #2511   +/-   ##
=======================================
  Coverage   65.48%   65.49%           
=======================================
  Files          99       99           
  Lines       19698    19721   +23     
=======================================
+ Hits        12900    12916   +16     
- Misses       6798     6805    +7     

Impacted Files	Coverage Δ
srtcore/queue.cpp	81.34% <ø> (+1.19%)	⬆️
srtcore/packet.cpp	45.94% <39.21%> (-6.53%)	⬇️
srtcore/buffer_snd.cpp	67.10% <0.00%> (-0.66%)	⬇️
srtcore/core.cpp	59.11% <0.00%> (+0.23%)	⬆️

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