Remove unnecessary dependencies

[jpfeuffer]

E.g. I recently removed apache.commons.text / apache.commons.lang3.text from IndexLoader since the methods are either deprecated or the packages are not shipped in the knime update site anymore.
Options:

1. check how knime does it now
2. think about if really needed (here: system property substitution in file paths) and remove/comment out (currently done). Commit 8a7955c and related
3. write your own
4. use/inherit from knime classes properly or ask for an API