Save/Load diagram

[antoineatstariongroup]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of the UI-DSM
• I have searched open and closed issues to ensure it has not already been reported

Description

Number of available diagrams should be bumped to 20.
Loading the configuration should be done by a dropdown instead of a popup

Steps to Reproduce

System Configuration

• UI-DSM version:
  • UI-DSM:
  • Other:
• Environment (Operating system, version and so on):
• .NET Framework version:
• Additional information: