readtags: revise feature listing ptags (including an incompatible change)

[masatake]

• make -Q,--filter not work on ptags when -P,--with-pseudo-tags is specified together

  With this version, -Q,--filter option doesn't affect the pseudo tags listed
  with -P,--with-pseudo-tags option. -Q,--filter option specified wth
  -P,--with-pseudo-tags option affect only regular tags.

  To extract speicifed pseudo tags, use -Q,--filter option with
  -D,--list-pseudo action.

• make formatter work with -D,--list-pseudo-tags option

  An example extracting the value of !_TAG_PROC_CWD:

     $ ./readtags -t podman.tags -Q '(#/.*CWD.*/ $name)' -F '(list $input #t)' -D
     /home/yamato/var/ctags-github/
  

NOTE: the changes should not have a negative impact on Citre.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.84%. Comparing base (40274e7) to head (b6d894c).
Report is 14 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4095      +/-   ##
==========================================
+ Coverage   85.82%   85.84%   +0.01%     
==========================================
  Files         241      241              
  Lines       62487    62525      +38     
==========================================
+ Hits        53632    53675      +43     
+ Misses       8855     8850       -5     

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