*refactoring of Base implementation of class ImageJpegLoader (part 4). #657

Job	Run time
build_aarch64_cross (Debug)	3m 57s
build_and_test_gcc_new (13, Debug)	15m 54s
build_and_test_clang (Debug)	15m 7s
build_aarch64_cross (Release)	4m 36s
build_and_test_gcc_new (13, Release)	19m 39s
build_and_test_clang (Release)	16m 17s
build_and_test_gcc_old (10, Debug)	14m 21s
build_and_test_gcc_old (10, Release)	16m 11s
build_and_test_mingw (Debug)	18m 33s
build_and_test_gcc_old (11, Debug)	14m 20s
build_and_test_mingw (Release)	18m 16s
build_and_test_gcc_old (11, Release)	16m 30s
build_arm_cross (Debug)	4m 35s
build_arm_cross (Release)	3m 22s
	3h 1m 38s

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