Error types everywhere instead of String#944

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fluffysquirrels wants to merge 7 commits intoRust-SDL2:masterfrom fluffysquirrels:error-handling

+717-709

Commits on Nov 15, 2019

Rename Error to ErrorCode.
Alex Helfet
committed

Commits on Nov 16, 2019

Fix compiler warnings.
Alex Helfet
committed

Commits on Nov 18, 2019

Convert all Result<_, String> to Result<_, Error>
Alex Helfet
committed
Use failure crate for error handling in examples/animation.rs
Alex Helfet
committed
Error handling in examples/animation without failure.
Alex Helfet
committed
Replace usage of try! with ? to fix compiler warnings.
Alex Helfet
committed

Commits on Nov 19, 2019

Fix error handling for all examples.
Alex Helfet
committed