v1.0 Changes

Revamping the sol! macro bindings

• Contract and RPC codegen made cleaner by removal of the T transport generic
• Improving the function return types by removing the need for _0
• Changes to function call bindings e.g pub struct balanceOfCall { _0: Address } to pub struct balanceOfCall(pub Address)
• Changes to event bindings
• Changes to error bindings

Simplify ABI encoding and decoding

• ABI encoding function return structs
• Removing validate: bool from the abi_decode methods

Other breaking changes

• Removal of the deprecated Signature type. PrimitiveSignature is now aliased to Signature
• Renaming methods in User-defined types (UDT)'s bindings and implementing From and Into traits for UDT's
• Bumping getrandom and rand
• Removal of From<String> for Bytes

If you'd like to dive into the details of each change, please take a look at this PR