Bug and Style checker

• Added SpotBugs, Spotless, and Gradle Githook to Gradle build.
• Updated format on files

SpotBugs (FindBugs successor)

• Added SpotBugs to Gradle build to find common bugs to the code
• Check main code: ./gradlew spotbugsMain
• Check test code: ./gradlew spotbugsTest
• spotbugsMain and spotbugsTest are ran automatically on git commit

Spotless

• Added Spotless to Gradle build to check code formatting based on the Eclipse format XML file (src/resources/nshmp.eclipse-format.xml)
• Check code: ./gradlew spotlessCheck
• Apply format: ./gradlew spotlessApply
• spotlessCheck is automatically ran on Git push

Gradle Githook

• Added Gradle Githook to allow Git hooks