Updated so that users can change flex, size, min, max... dynamically

[Sten435]

Updated:

• Users can specify the KEY for a given area.
• They can also change the flex, size, min, max... using the following functions:

  AreaHelper.setFlex(...)

  AreaHelper.setIndex(...)

  AreaHelper.setSize(...)

  AreaHelper.setMin(...)

  AreaHelper.setMax(...)

[Sten435]

The reason i create this because i need this for personal projects. And there was no easy way to change the flex without rebuilding whole widgets.