34573 Ensures flutter jar is added to all build types on plugin projects (cla: yes, t: gradle, tool, waiting for tree to go green)

34597 [Material] Update slider gallery demo, including range slider (cla: yes, f: material design, framework)

34599 [Material] ToggleButtons (cla: yes, f: material design, framework, severe: new feature)

34624 Break down flutter doctor validations and results (cla: yes, t: flutter doctor, tool)

34626 AsyncSnapshot.data to throw if error or no data (cla: yes, framework)

34660 Add –target support for Windows and Linux (cla: yes, tool)

34665 Selection handles position is off (a: text input, cla: yes, framework, severe: API break)

34669 Bundle ios dependencies (cla: yes, tool)