Remove most uses of `extern crate` · ixmilia/dxf-rs@ff9e212

Run cargo test --verbose: src/misc_tests/encoding.rs#L9

unresolved import `self::image`

Run cargo test --verbose: src/entity.rs#L2647

cannot find macro `approx_eq` in this scope

Run cargo test --verbose: src/entity.rs#L2646

cannot find macro `approx_eq` in this scope

Run cargo test --verbose: src/entity.rs#L2645

cannot find macro `approx_eq` in this scope

Run cargo test --verbose: src/entity.rs#L2644

cannot find macro `approx_eq` in this scope

Run cargo test --verbose: src/entity.rs#L2643

cannot find macro `approx_eq` in this scope

Run cargo test --verbose: src/entity.rs#L2640

cannot find macro `approx_eq` in this scope

Run cargo test --verbose: src/entity.rs#L2639

cannot find macro `approx_eq` in this scope

Run cargo test --verbose: src/entity.rs#L2638

cannot find macro `approx_eq` in this scope

Run cargo test --verbose: src/entity.rs#L2637

cannot find macro `approx_eq` in this scope

Run cargo build --verbose: src/code_pair_iter.rs#L13

struct `DirectCodePairIter` is never constructed

Run cargo test --verbose: src/code_pair_iter.rs#L13

struct `DirectCodePairIter` is never constructed

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