updates sandbox component 'caseditor-opennlp-plugin' to be compatible with latest opennlp-tools release (#64)
- adjusts opennlp-tools to 2.1.0
- adjusts parent project (org.apache.apache) to version 18
- adjusts Java language level to 11
- updates `uimaj` dependencies to version 3.3.1
- updates `maven-bundle-plugin` to version 5.1.8 so things work with class files compiled in Java 11 format
- adjusts some array declarations to comply with Java, not C style
- removes unused imports
30 files changed
