add in SplineROITool and SplineROITool.SplineTypes.Linear calculate Mean and Std Dev (feature)

[VladimirKondratenko]

Prerequisites

Which version are you using? 1.84.1
Did you search existing issues? Yes

Description

Good day! I would like to suggest feature for update some tools in cornestonejs. Could you add In SplineROITool and SplineROITool.SplineTypes.Linear add Mean and Std Dev or add possibilite edit this fucntion, it's very important for our project. We saw in node modules this tool, and we couldn't edit it ourselves. Thanks!

Expected behavior:

Actual behavior: (What actually happened)