near-sdk (Rust) 0.11.0

API breaking changes

• Renamed Map to UnorderedMap and Set to UnorderedSet to reflect that one cannot rely on the order of the elements in them. In this PR and in https://github.com/near/near-sdk-rs/pull/154

Other changes

• Added ordered tree implementation based on AVL, see TreeMap. https://github.com/near/near-sdk-rs/pull/154

• Made module generated by ext_contract macro public, providing more flexibility for the usage: https://github.com/near/near-sdk-rs/pull/150

Contract changes

• Fungible token now requires from the users to transfer NEAR tokens to pay for the storage increase to prevent the contract from locking the users from operating on it. https://github.com/near/near-sdk-rs/pull/173
• Renaming method of fungible token set_allowance => inc_allowance. Added dec_allowance method. https://github.com/near/near-sdk-rs/pull/174
• Remove possibility to do self-transfer in fungible token. https://github.com/near/near-sdk-rs/pull/176
• Improving fungible token comments https://github.com/near/near-sdk-rs/pull/177
• Add account check to get_balance in fungible token https://github.com/near/near-sdk-rs/pull/175
• In fungible token remove account from storage if its balance is 0 https://github.com/near/near-sdk-rs/pull/179