Migrate to version 0.70.0

Fixed the equatable functionality in our PieChartSectionData

Please check any code that compares PieChartSectionData classes or other objects containing PieChartSectionData and make sure it is not affected by this change.

BarChart is not const anymore

We added an assert to check if transformations are allowed depending on the BarChartData.alignment property. If you are using BarChart as a const, you need to remove the const keyword from the BarChart constructor. The compiler will show you an error if you try to use BarChart as a const.