improve mismatch formatting

[RohrerF]

Summary of the changes

• mismatch formatting improved when one property doesn't match. if there are multiple Properties not matching it will only show the first one
  

Addresses #42

[RohrerF]

@nscheibe downside of this solution is that we have to switch from Assert.Equals to Assert.True since XUnit does not support a custom message on Assert.Equals

[nscheibe]

Okay let me check it tonight. The only important thing is, that the same exception is thrown (otherwise its a breaking change)... But if its Assert.Equal or Assert.True... I personally dont care :)

[RohrerF]

The exception will change that's why some tests are failing

[glucaci]

Are you still on this @RohrerF ?

[glucaci]

/azp run

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[sonarqubecloud]

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