refactor(components): update to use shadow DOM and work with css variables

- updates components to use shadow DOM or scoped if they require css variables
- moves global styles to an external stylesheet that needs to be imported
- adds support for additional colors and removes the Sass loops to generate colors for each component
- several property renames, bug fixes, and test updates

Co-authored-by: Manu Mtz.-Almeida <manu.mtza@gmail.com>
Co-authored-by: Adam Bradley <adambradley25@gmail.com>
Co-authored-by: Cam Wiegert <cam@camwiegert.com>

core/src/components/alert/alert-interface.ts

@@ -29,5 +29,5 @@ export interface AlertButton {
   text: string;
   role?: string;
   cssClass?: string | string[];
-  handler?: (value: any) => boolean|void;
+  handler?: (value: any) => boolean | void | {[key: string]: any};
 }