Add IfCondition to while (since DMD-FE 2.097.0)

[WebFreak001]

to fix Pure-D/serve-d#228

[codecov]

Codecov Report

Merging #462 (b6e96bb) into master (b94a157) will increase coverage by 0.31%.
The diff coverage is 85.41%.

@@            Coverage Diff             @@
##           master     #462      +/-   ##
==========================================
+ Coverage   82.86%   83.17%   +0.31%     
==========================================
  Files          11       11              
  Lines        8321     8338      +17     
==========================================
+ Hits         6895     6935      +40     
+ Misses       1426     1403      -23     

Impacted Files	Coverage Δ
src/dparse/parser.d	91.30% <72.72%> (+<0.01%)	⬆️
src/dparse/astprinter.d	94.31% <78.57%> (-0.45%)	⬇️
src/dparse/formatter.d	45.93% <95.45%> (+2.00%)	⬆️
src/dparse/ast.d	70.85% <100.00%> (+0.60%)	⬆️

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[WebFreak001]

added more exhaustive tests and added support for scope, going to merge in