0.4.0

• New WebView support for Web! Embedded videos and Iframes now work great!
• Improved WebView embedding for Android and iOS.
• New SetMapVariableAction support for map variables.
• Support more conditions.
  • isEmpty, isNotEmpty, contains
  • isOdd, isEven, isNull
• Add remove for list type variable.
• Remove deprecations and update formatting and documentation.
• Update Stack rendering to match Flutter's updated Stack behavior.
  • If a stack is wrapping, use margin to position children to preserve Stack layout.
  • Change magnetization delegate to lock child inside the bounds of a stack that is wrapping.
  • Disallow wrapping if any child is outside the bounds of the wrapping node.
• Fix row/column scrollable widget tree implementation to render more accurately, especially with padding.
• Fix EdgeInsets.LTRB missing values in codegen.
• Round snapping value in NodeInteractionFreeform to discourage negative precision errors.
• Rename automaticallyCollectCrashReports to automaticallySendCrashReports.