Update Gradle, update dependencies, update Java #113
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Gradle: 3.5 -> 6.3
Java: 8 -> 14
Slf4J: 1.7.25 -> 1.7.30
Logback: 1.2.2 -> 1.2.3
Janino: 3.0.7 -> 3.1.2
Nifty: 1.4.2 -> 1.4.3
Bundled JDK: Must be switched from OracleJDK to OpenJDK.
PMD: Removed targetComp Java 1.7