Upgrade to Flutter 3.10 + minor bug fixes

[BenPoell]

• fixed problems coming with Flutter 3.10
• found some null checker exceptions during testing + fixed them
• unfortunately made a bracket wrong, cause an endless loop but found it in testing + fixed it

[koutja]

Please add for BoardView customization 2 arguments Key? listViewKey and ScrollPhysics? listViewPhysics
I need these settings to control the offset across entire pages

Widget listWidget = ListView.builder(
      key: listViewKey,
      physics: listViewPhysics ?? const ClampingScrollPhysics() ,
      ...

Example:

    Widget listWidget = ListView.builder(
      key: const PageStorageKey('boardview'),
      physics: const PageScrollPhysics(),

[philip-plateaumed]

Hi @koutja kindly have this PR go in if what you've requested is a new feature it can be done on another PR, some of us depend on this. Thanks a lot.