XML Based Resource System (XRC): new parser

[masatake]

https://docs.wxwidgets.org/3.0/overview_xrc.html

[masatake]

Till 7.0, I will convert this short C program into:

--xpath-langdef=XRC{base=XML}{dedicated}
--map-XRC=+.xrc

--kinddef=o,object,objects

--xpath-tabledef:main
--xpath-XRC=main/resource//object/@name:o:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a8513a0) 85.31% compared to head (31f771f) 85.32%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3897   +/-   ##
=======================================
  Coverage   85.31%   85.32%           
=======================================
  Files         233      234    +1     
  Lines       55911    55933   +22     
=======================================
+ Hits        47703    47725   +22     
  Misses       8208     8208           

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