Add calculation for true block chance

[muzsor]

Hi!

This pull request implements a calculation for the true block chance in the Calculations tab.

It adjusts the block rate display to show the actual probability directly, as the in-game display is inaccurate and the block rate on the Calculations tab currently requires further conversion.

Correct me if there are any issues.

Thanks!

[johnfriedrich]

Maybe its just me, but I expect the block rate display the same as ingame even though its wrong to avoid confusion.
However you could display the actual block rate in the tooltip or even as extra stat

[muzsor]

That makes sense.

But Frostiae already mentioned in the info that

This value may be different than the one you see in the character window as it takes everything into account, such as minimums, maximums and the opponent's stats. This is your true block rate.

It seems that the current calculated block rate doesn’t quite match what we observe in the game, and the max and min limits might no longer apply.

I made these changes based on the reasons mentioned above. Let’s wait and see what Frostiae’s final thoughts are.

Thank you!