refactor mixSwap && add trade adapter

contracts/SmartRoute/intf/IDODOAdapter.sol

@@ -0,0 +1,16 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+interface IDODOAdapter {
+    
+    function sellBase(address to, address pool) external;
+
+    function sellQuote(address to, address pool) external;
+}

contracts/SmartRoute/intf/IDODOV2Proxy01.sol

@@ -138,14 +138,14 @@ interface IDODOV2Proxy01 {
         uint256 deadLine
     ) external payable returns (uint256 returnAmount);
 
-    function mixSwapV1(
+    function mixSwap(
         address fromToken,
         address toToken,
         uint256 fromTokenAmount,
         uint256 minReturnAmount,
+        address[] memory mixAdapters,
         address[] memory mixPairs,
-        uint256[] memory directions,
-        address[] memory portionPath,
+        uint256 directions,
         bool isIncentive,
         uint256 deadLine
     ) external payable returns (uint256 returnAmount);

contracts/SmartRoute/intf/IUni.sol

@@ -9,4 +9,12 @@ interface IUni {
         address to,
         uint deadline
     ) external returns (uint[] memory amounts);
+
+    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
+
+    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
+
+    function token0() external view returns (address);
+    
+    function token1() external view returns (address);
 }