Document assert_or_err; Add docs logo; Restructure tests; Bump minor; Update lints; Add new errors: IllegalFlag, IllegalShifter, InvalidOpcode, UnknownMnemonic; Update readme; Update documentation; Improve diagnostics. Arm32: Encode more instructions for Thumb; Make InstructionCodec::encode_thumb return tuple; Add new instructions: Test, TestEquivalence, UnsignedSaturate, PreloadData, BranchLinkExchange, Swap, Load, Store; Rework Flag; Add Address type; Add as_register method to Shifter; Add skip_words, skip_halfwords, and skib_bytes methods to InstructionCodec; Add from_register method to Shifter; Add Thumb decoding to InstructionCodec; Add from_u8 method to Predicate; Add from_u8 method to Register; Implement FromStr for Instruction; Add new Sflag, Bflag, and Tflag flags; Add seek_to method to InstructionCodec.