Dev Env settings window has been created - all required restructuring implemented.

[janosmurai]

Type Of Change

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Any modification in the test cases
• Any modification in the documentation

Checklist:

• I have read and followed the contribution guideline.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• All the test cases pass and new modifications in the production code are 100% covered.
• I have made corresponding changes to the documentation.

Related Issue

Closing:
DEM-196

Description

First version of the new Dev Env settings window has been created.
Defining a "type" for a tool image is not required anymore. This provides better
flexibility when creating new Dev Envs. Also makes it easier to understand when
tool images with more then one tool are used.

In this new window type, which is the same for the create and modify command
the user can select the tool iamges which then can form a Dev Env.

Note:
The 100% coverage is not achieved for code segment known to change in the future.

How Has This Been Tested?

Tested on Ubuntu 22.04.