[JXR-176] Remove dependency org.apache.commons:commons-lang3

[spannm]

The project depended on commons-lang3 for its StringUtils.replace method only, which is a null-safe alternative to String.replace.
Review of StringUtils usage shows that affected variables cannot be null. Thus the dependency can be replaced by core Java.

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[spannm]

Hi @slawekjaranowski hope you are doing great. Could you look at my PR and hopefully merge?

[slawekjaranowski]

Please resolve conflicts.
For such PR jira issue will be appreciated.

[spannm]

Hi @slawekjaranowski,
Thanks again for your feedback.
Pull request rebased to master, merge conflicts resolved, issue JXR-176 created. Please re-review.
cheers,
Markus