gateio: queryDepositAddress: fixup

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removed obsolete bter php and python files from the repo ccxt#1711

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minor edits and deduplication for gateio fetchDepositAddress/createDe…

…positAddress ccxt#1709

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1.10.960

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1.10.959

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1.10.958

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1.10.957

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curl timeouts in ms

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build: transpile: now can transpile one exchange

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kucoin: transpilation

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