Description

Case Tree visible as Management in CaseTreeView in Pretty Json Format, can now be downloaded as both .json and .xml format.

Fixes #267

Type of change

[ ] Bug fix (non-breaking change which fixes an issue)
[x] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] This change requires a documentation update

Also, include screenshots for the verification and reviewing purpose.

[x] My code follows the style guidelines of this project
[x] I have performed a self-review of my own code
[x] I have commented my code, particularly in hard-to-understand areas
[x] I have made corresponding changes to the documentation
[ ] My changes generate no new warnings
[ ] I have added tests that prove my fix is effective or that my feature works (N/A)
[ ] New and existing unit tests pass locally with my changes (N/A)
[ ] Any dependent changes have been merged and published in downstream modules (N/A)

Note: Warnings in Dev Mode console for parsing and converting .json to .xml