refactor(ini): simplify parse()

[timreichen]

This PR moves all parser functionality from IniMap into the parse() function.
There is a load of unnecessary overhead generated the way parse() works in IniMap.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.34%. Comparing base (68a8460) to head (493f3c7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6512      +/-   ##
==========================================
+ Coverage   95.08%   95.34%   +0.25%     
==========================================
  Files         576      575       -1     
  Lines       43337    43127     -210     
  Branches     6466     6455      -11     
==========================================
- Hits        41208    41119      -89     
+ Misses       2089     1968     -121     
  Partials       40       40              

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