Use escaped path in report-ng when accessing JAR

[arbu]

Description

Previously the URI to the JAR file of report-ng was constructed using the unescaped path. This would fail if there are carecters in the path that are not valid in the path component of a URI (e.g. spaces). This pull request changes the construction of the URI to use the escaped path component and makes report-ng work with local maven repos that have spaces and other
special characters in their path.

Fixes #33

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• 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
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Tested on Windows in Git Bash and on Ubuntu 20.04.