D: parse const(T), immutable, inout and shared type qualifiers

[ntrel]

https://dlang.org/spec/const3.html
https://dlang.org/spec/const3.html#inout

inout is not working yet (missing test symbol).

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (4622e54) 82.96% compared to head (b7a7e08) 82.96%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3709   +/-   ##
=======================================
  Coverage   82.96%   82.96%           
=======================================
  Files         226      226           
  Lines       54962    54969    +7     
=======================================
+ Hits        45598    45606    +8     
+ Misses       9364     9363    -1     

Impacted Files	Coverage Δ
parsers/c-based.c	80.82% <100.00%> (+0.19%)	⬆️

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[masatake]

Thank you.

FYI, ".b" test case can be used to gather "FIXME" input.
See https://docs.ctags.io/en/latest/testing-parser.html#gathering-test-cases-for-known-bugs .