Better Gas masks - Model concentration better, and make gas mask cart…

…iges last longer (#68570)

* Some initial work on better modelling of gas mask usage, doesn't work as I can't get the intensity level

* add absorbtion calculation

* Modify calculation to make gas mask last 20 minutes from full charge in thick toxic gas

* Add low gas charges warning

* Change gas_absorption _factor to be a timescale

* Fix loading of concentration

* Add documentation

* linting C++ code

* Apply suggestions from code review

Add linting suggestions

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* Apply suggestions from code review

* Better documentation clarity

* Update src/iuse.cpp

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Zhilkin Serg <[email protected]>