Assorted set of improvements

[kunitoki]

• zip64 support
• improved lower and uppercase conversions with extended unicode support
• allow Datagram sockets to join multicast in the present of multiple interfaces
• allow constructing String from string_view and wstring_view
• docs cosmetics

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 73.95833% with 25 lines in your changes missing coverage. Please review.

Project coverage is 41.14%. Comparing base (cf7b90d) to head (611127b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
modules/yup_core/zip/yup_ZipFile.cpp	79.71%	14 Missing ⚠️
modules/yup_core/network/yup_Socket.cpp	0.00%	8 Missing ⚠️
modules/yup_core/text/yup_String.cpp	0.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
+ Coverage   40.87%   41.14%   +0.27%     
==========================================
  Files         303      303              
  Lines       29994    30082      +88     
==========================================
+ Hits        12259    12377     +118     
+ Misses      17735    17705      -30     

Files with missing lines	Coverage Δ
modules/yup_core/containers/yup_PropertySet.h	100.00% <ø> (+100.00%)	⬆️
modules/yup_core/network/yup_Socket.h	0.00% <ø> (ø)
modules/yup_core/text/yup_CharacterFunctions.cpp	77.92% <100.00%> (+36.65%)	⬆️
modules/yup_core/text/yup_String.h	93.33% <ø> (ø)
modules/yup_core/yup_core.cpp	100.00% <ø> (ø)
modules/yup_core/text/yup_String.cpp	83.37% <0.00%> (-0.21%)	⬇️
modules/yup_core/network/yup_Socket.cpp	0.00% <0.00%> (ø)
modules/yup_core/zip/yup_ZipFile.cpp	81.97% <79.71%> (+1.32%)	⬆️

... and 3 files with indirect coverage changes

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