resolves#25570, resolves#23213
BREAKING CHANGE:
The `--background` and `--background-checked` variables have been renamed to `--track-background` and `--track-background-checked`, respectively.
- Updates Material Design toggle background & box-shadow to match spec
- Adds the following variables: --handle-box-shadow, --handle-height, --handle-max-height, --handle-transition, --handle-width, --handle-spacing
- Improves customization of toggle by inheriting properties where possible and auto-adjusting the handle height and position based on the width and height of the toggle
Closes#19868, closes#20474
- 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>
