expansion_tile_card 3.0.0

An "expansion" on the Flutter SDK's standard ExpansionTile, to create a Google Material Theme inspired raised widget, ExpansionTileCard, instead.

[3.0.0] - Flutter 3.10 fixes

• Breaking Now optimized for Flutter 3.10+ and Dart 3.x
• Replace deprecated accentColor. Thanks @etiennedv-mathu
• Rebuild example app. Thanks @sergdeus

[2.0.0] - Null Safety and more

• Breaking - Migrate to Null Safety. Requires newer build of Flutter
• Add expandedTextColor so that expanded card can use alternate color. Thanks @msandwidi!
• Adjust default padding so title doesn't move
• Migrate example package to use TextButton instead of FlatButton

[1.1.0] - Customizability

• Breaking - Migrate text to 2018 Material Design spec. Requires Flutter >= 1.17.0
• Add initialElevation to adjust shadows/heights -- Hannnes1
• Add isThreeLine to match ListTile -- Hannnes1
• Add shadowColor to not use Material's default shadowing -- Hannnes1
• Add animateTrailing to allow the trailing widget to rotate on expand/collapse -- Hannnes1
• Add collapse, expand, and toggleExpansion methods. -- Solution credit: Slightfoot
• Make ExpansionTileCardState class public
• Include demo of collapse & expand in reworked example app.

[1.0.3] - More customizability

• Introduce contentPadding to alter inner padding of ListTile.
• Surface background color options as baseColor and expandedColor.

[1.0.2+2] - Inkwell fix

• Use the same border for the Inkwell as used for the Card

[1.0.2+1] - README update

• Put a GIF into the README

[1.0.2] - API and visual improvements

• Add option to provide your own animation curves.
• Add option to customize animation duration.
• Use better animation technique for padding.
• Use custom InkWell, to respect rounded edges.

[1.0.1] - Fix Flutter stable

• Swap the newer textTheme.subtitle1 for the older textTheme.subhead.

[1.0.0+1] - Example directory

• Provide an /example directory.

[1.0.0] - Initial release.

• Swap ExpansionTile's Container for a Material widget.
• Attach the Material's elevation to an Animation.
• Add a rounded border which hides in plain sight until raised.
• Drop borderColor and backgroundColor; use theme.canvasColor and theme.cardColor instead.