Megapose improvements

[SamFlt]

This PR brings some improvements to Megapose:

• A fix for network communication in vpMegaPose on Windows
• Notebook version made install fail
• Add a verbose mode to print timings, showing render and model times
• The client's disconnection from the server is now cleaner and does not generate an exception on the server
• Added some documentation on using megapose on Windows: the server should be run in WSL, as it seems that there are some issues with panda3D on Windows
• Added some documentation on the PBVS servoing example and referenced it in the megapose tracking tutorial
• The default model is now RGB, as it is the most usable one (in terms of inference speed)
• During install, if the user uses relative paths, they are converted to absolute ones in order for the megapose server to run from any directory

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.03% ⚠️

Comparison is base (3f74e10) 54.34% compared to head (506910d) 54.32%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1216      +/-   ##
==========================================
- Coverage   54.34%   54.32%   -0.03%     
==========================================
  Files         405      405              
  Lines       49822    49822              
==========================================
- Hits        27078    27068      -10     
- Misses      22744    22754      +10     

see 4 files with indirect coverage changes

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[fspindle]

Ready to merge when ci ok