Change color of labels that correspond to disabled inputs

[dragunoff]

• Add a new widget type for input and extend it from other input widgets
• Add a new label type that can be linked to an input widget
• Change the label color when the input's disabled state changes

Closes #19860

[dragunoff]

Update: added For properties to yaml template for lobby options and removed that from the chrome logic (prorps @abcdefg30 for pointing that out).

[RoosterDragon]

Why don't we just rely on TextColorDisabled and GetColorDisabled already defined on the base ButtonWidget class?

In particular ButtonWidget defines:

public Color TextColor = ChromeMetrics.Get<Color>("ButtonTextColor");
public Color TextColorDisabled = ChromeMetrics.Get<Color>("ButtonTextColorDisabled");

So that means instead of using the ButtonTextColor/ButtonTextColorDisabled pair of styles which presumably work well together we are using ButtonTextColor/TextDisabledColor which might not necessarily work well?

[RoosterDragon]

Is this because the text of a checkbox is not usually on the same background as a regular button? If so I would recommend getting rid of the shadowed TextColorDisabled and just setting it in the constructor instead.

i.e. don't define public new Color TextColorDisabled ... and in the constructors do:
TextColorDisabled = ChromeMetrics.Get<Color>("TextDisabledColor");

This means you avoid the following surprise:

CheckboxWidget c = some_value;
c.TextColorDisabled; // Is TextDisabledColor from ChromeMetrics.
ButtonWidget b = c;
b.TextColorDisabled; // Is ButtonTextColorDisabled from ChromeMetrics.

// c.TextColorDisabled is not equal to b.TextColorDisabled(!)

[dragunoff]

@RoosterDragon you guessed correctly. Checkboxes inherit from buttons but they don't look like buttons - the text on a checkbox is ultimately a label and not a button and should get its colors from the same place that labels do. I was looking for a better way to do this - thanks for your suggestion, I will look into it. Or if you have a better idea, please share :-)

[dragunoff]

Updated the checkbox widget to use the approach suggested here.

[dragunoff]

Update: rebased and addressed #19938 (comment)

[abcdefg30]

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