Revert back to Java 9.

pom.xml

src/main/java/azgracompress/benchmark/BenchmarkBase.java

.../azgracompress/benchmark/ScalarQuantizationBenchmark.java

.../azgracompress/benchmark/VectorQuantizationBenchmark.java

src/main/java/azgracompress/cli/ParsedCliOptions.java

...ain/java/azgracompress/compression/ImageDecompressor.java

...n/java/azgracompress/compression/VQImageDecompressor.java

src/main/java/azgracompress/fileformat/QCMPFileHeader.java

...azgracompress/quantization/vector/LBGVectorQuantizer.java