refactor: Removing all dependency to Guard.NET.

[joachimgoris]

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As per issue 577. This PR removes all dependency on Guard.NET. All checks done by Guard.NET have been replaced with if checks.

Closes #577

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🔨 Latest commit	2a400193b0bac0d124daba38abca9766ec6b1d64

[joachimgoris]

@stijnmoreels

We should use ArgumentException when checking for blank strings, not ArgumentNullException.

Only when checking for blank strings?

[stijnmoreels]

@stijnmoreels

We should use ArgumentException when checking for blank strings, not ArgumentNullException.

Only when checking for blank strings?

We can fallback on ArgumentException for both null, "" and " " inputs.

[joachimgoris]

I'm halfway through moving ArgumentNullExceptions to ArgumentException. I've also took the liberty of adding and adapting the following comments

[joachimgoris]

Adapted all the code. Ready for another review