Remove severity 'experimental' from checkComparisonOfBoolWithBool()

[chrchr-github]

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@chrchr-github @danmar @pfultz2 @orbitcowboy
There's currently no way to enable experimental check swith a binary at all making it essentially dead code.

So we should add an --experimental flag, move these checks into inconclusive or completely remove them completely.

There's currently only two places which are using this.

Also there's some code we put behind if (false) - so if we keep the certainty in question we should probably leverage it for that code so it can at least be run in tests. This would also get rid of the "unreferenced" code warnings in Visual Studio.

For full support of experimental we would also need to make it like inconclusive adding the information to the finding and the output so these are flagged as such which would complicate things. So adding the full support does not seem feasible.