add support for disabling anti-aliasing in BitmapBackend #430

Job	Run time
run_all_examples	17s
msrv	14s
build_and_test (macos-latest)	1m 37s
build_and_test (ubuntu-latest)	1m 42s
cargo-doc	27s
test_all_features	1m 1s
build_and_test (windows-latest)	1m 45s
	7m 3s

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