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/css/ionic.scss

@@ -0,0 +1,10 @@
+@import "./normalize";
+@import "./structure";
+@import "./typography";
+@import "./colors";
+
+@import "./padding";
+@import "./float-elements";
+@import "./text-alignment";
+@import "./text-transformation";
+@import "./flex-utils";