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remove unused imports, run auto-formatter #3346

Job	Run time
java_matrix	3s
download_test_data	4s
build_macos	2m 52s
build	2m 50s
unit_tests (21)	3m 1s
unit_tests (25)	3m 0s
test_clara	4m 5s
test_run-groovy	1m 6s
spotbugs	7m 44s
test_coatjava (ubuntu-latest, eb-eg)	2m 5s
test_coatjava (ubuntu-latest, eb-ep)	3m 5s
test_decoder	2m 22s
test_coatjava (ubuntu-latest, eb-enc)	2m 6s
test_coatjava (ubuntu-latest, eb-eftpi)	3m 7s
test_coatjava (ubuntu-latest, eb-en)	2m 35s
test_coatjava (ubuntu-latest, kpp)	4m 16s
test_coatjava (ubuntu-latest, eb-epc)	2m 36s
release_build	-1s
test_coatjava_macos	2m 59s
generate_documentation	1m 8s
deploy_web_pages	0s
final	3s
	51m 6s