Sheet enhancements

[krbz999]

• Fix 'value' not being shown on hand/pile sheets for their cards. [Closes #25]
• Fix 'type', 'suit', and 'value' not being hidden on hand/pile sheets when they are face down. [Closes #26]
• Contextually hides some buttons on hand/pile/deck sheets when they do not make sense to use. [Closes #27]
• Added the 'Configuration' tab to hand/pile sheets allowing for image, size, descriptions to be changed. [Closes #23, closes #28].
• Set the default tab to be the 'Cards' tab on all Cards sheets except Deck sheets. [Closes #29]
• Added a render property to the custom dialog class.
• The number slider in the dealDialog is now automatically adjusted when target hands/piles are selected. [Closes #30]
• The number input in the drawDialog is now a slider and automatically adjusts when the targeted deck is changed. [Closes #31]

[JPMeehan]

Rotation is unlabeled

[JPMeehan]

Otherwise this looks good, great improvements

[krbz999]

Please add label for the default rotation field

The field has a placeholder of "Rotation" (localized), but an issue with NumberField#toFormGroup results in a value of null being ignored. Setting it to "" for now.