Resolve "Align formatting and linting with Orekit settings"
Closes #74 (closed)
- Sets up checkstyle and eclipse formatter (enforced and applied using spotless), with rules aligned with Orekit
- Formats the codebase and fixes checkstyle issues
- Update pom.xml files with cesiumlanguagewriter dependency
- Fixes malformed license header regex
- Updates readme with linting instructions