v0.18.0: Merge pull request #1643 from material-components:prepare-release

Changed

• fab
  • BREAKING removed --mdc-fab-box-shadow-hover; use --mdc-fab-box-shadow
  • BREAKING removed --mdc-fab-box-shadow-active; use --mdc-fab-box-shadow
  • Ripple now uses and exposes mwc-ripple's CSS custom properties API
• icon-button
  • BREAKING now uses lazy mwc-ripple in its implementation
• icon-button-toggle
  • BREAKING now uses lazy mwc-ripple in its implementation
• select
  • render methods have been renamed and reorganized (breaking if extending and
    overriding)
• slider
  • An upcoming change will migrate the slider to use the MDC M2 slider. In
    preparation for this, the MWC slider => MDC slider dependency will not be
    updated until the migration is complete.
• textfield
  • render methods have been renamed and reorganized (breaking if extending and
    overriding)
  • remove extra space between label and required asterisk (*)
• top-app-bar(-fixed)
  • --mdc-top-app-bar-width is now configurable

Fixed

• button
  • ripple will unripple when mouse/touchend happens outside of button
• checkbox
  • Remove animation class after the animation ends to prevent replaying animations when hidden and shown, or removed and readded to the DOM
• select
  • label will be highlighted before selected text during horizontal navigation
    for screen readers
  • filled variant now has a ripple
• textarea
  • label will be highlighted before input during horizontal navigation for
    screen readers
  • minlength attribute is now supported
  • inputmode attribute is now supported
  • autocapitalize attribute is now supported
  • remove extra space between label and required asterisk (*)
• textfield
  • label will be highlighted before input during horizontal navigation for
    screen readers
  • remove extra space between label and required asterisk (*)

Added

• mwc-circular-progress implemented.
• mwc-circular-progress-four-color implemented.