Rework PlayerScore & DealerScore variables to use a CInt conversion function instead of Val(label_score_...)

[FungusMcGoo]

As the game gets more complex, the math involved in determining blackjack should work better if convert to int instead of reading directly from the textbox

https://learn.microsoft.com/en-us/dotnet/visual-basic/language-reference/functions/type-conversion-functions