Fixed #313: Show CK_NoOp correctly.

[andreasfertig]

CK_NoOp stands for adding const or other qualifiers. Show this
conversion, if --show-all-implicit-casts is active.

This patch enables showing implicit casts for member-function calls
as well.

[codecov]

Codecov Report

Merging #314 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #314   +/-   ##
=======================================
  Coverage   97.64%   97.65%           
=======================================
  Files          23       23           
  Lines        2761     2767    +6     
=======================================
+ Hits         2696     2702    +6     
  Misses         65       65           

Impacted Files	Coverage Δ
CodeGenerator.cpp	98.75% <100.00%> (+<0.01%)	⬆️

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