[bug #68174] dlmread performance can be improved with modern C++

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Follow-up Comment #3, bug #68174 (group octave):=0A=0ARebase after Octave c=
ode refactoring, also some local re-factoring (the lambda=0Anow a separate =
helper function).=0A=0A(file bug68174_dlmread_fast_20260629_100.cset)=0A=0A=
Dmitri.=0A-- =0A=0A=0A(file #58769)=0A=0A    ______________________________=
_________________________=0A=0AAdditional Item Attachment:=0A=0AName: bug68=
174_dlmread_fast_20260629_100.cset Size: 14KiB=0A=0A<https://file.savannah.=
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