Add support for all possible Kendo/Telerik Components variants and configurations in ThemeBuilder.

For example, this includes all possible variants for creating a Kendo Button: 

• size
• shape
• rounded
• fillMode
• themeColor

The above should also be supported for various Kendo/Telerik components like 

- DateInput (requested through t.1633591)

- DropDownList (requested through t.1633591)