Refactor input file parser

[97gamjak]

No description provided.

[pq-perf-bot]

⚡ Performance (instruction count) — ✅ no regressions

per-benchmark breakdown

benchmark	base Ir	PR Ir	Δ
bondedForces	38.25M	38.25M	+0.00%	✅
boxTransforms	10.67M	10.67M	+0.00%	✅
constraints	11.06M	11.06M	-0.00%	✅
coulombKernel	5.80M	5.80M	+0.00%	✅
forceKernel	13.54M	13.54M	+0.00%	✅
integrator	32.91M	32.91M	-0.00%	✅
interWater	1679.92M	1679.92M	-0.00%	✅
kinetics	8.55M	8.55M	+0.00%	✅
linearAlgebra	2.08M	2.08M	+0.00%	✅
nonCoulombPairs	5.48M	5.48M	+0.00%	✅
shiftVector	5.81M	5.81M	+0.00%	✅
virial	10.04M	10.03M	-0.08%	✅

_{Deterministic callgrind instruction counts vs the base branch; gated at ±2%. Not wall-clock.}

[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.45%. Comparing base (c524e3a) to head (358d158).

Files with missing lines	Patch %	Lines
include/input/inputFileParser/inputParam.hpp	90.74%	7 Missing and 3 partials ⚠️
include/input/inputFileParser/inputConverter.hpp	97.14%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##              dev     #582    +/-   ##
========================================
  Coverage   91.44%   91.45%            
========================================
  Files         322      324     +2     
  Lines       14628    14771   +143     
  Branches     4915     4982    +67     
========================================
+ Hits        13377    13509   +132     
- Misses       1169     1177     +8     
- Partials       82       85     +3     

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[galjos]

Compiled the two headers against the PR head with a small ASan probe; the inline comments quote what it produced.

Main points, in order: dangling reference on duplicate registerKey; no line-shape or keyword normalization in parseLine; bool tokens uppercase-only while every existing parser and input file uses on/off. Nothing wires the registry yet, so nothing breaks today; the first migrated parser would hit all three.

Verified fine: enum conversion via mstd::enum_meta_t<T>::from_string at the pinned mstd commit, line numbers in messages match the existing parsers, test registered in CMake and run in CI.

Review done by Cursor (Claude) on my behalf.