feat: expand non-evm relay and route planning support

contracts/vendor/uniswap-v2-core/libraries/Math.sol

@@ -0,0 +1,23 @@
+pragma solidity =0.5.16;
+
+// a library for performing various math operations
+
+library Math {
+    function min(uint x, uint y) internal pure returns (uint z) {
+        z = x < y ? x : y;
+    }
+
+    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
+    function sqrt(uint y) internal pure returns (uint z) {
+        if (y > 3) {
+            z = y;
+            uint x = y / 2 + 1;
+            while (x < z) {
+                z = x;
+                x = (y / x + x) / 2;
+            }
+        } else if (y != 0) {
+            z = 1;
+        }
+    }
+}

contracts/vendor/uniswap-v2-core/libraries/SafeMath.sol

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+pragma solidity =0.5.16;
+
+// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)
+
+library SafeMath {
+    function add(uint x, uint y) internal pure returns (uint z) {
+        require((z = x + y) >= x, 'ds-math-add-overflow');
+    }
+
+    function sub(uint x, uint y) internal pure returns (uint z) {
+        require((z = x - y) <= x, 'ds-math-sub-underflow');
+    }
+
+    function mul(uint x, uint y) internal pure returns (uint z) {
+        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
+    }
+}

contracts/vendor/uniswap-v2-core/libraries/UQ112x112.sol

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+pragma solidity =0.5.16;
+
+// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))
+
+// range: [0, 2**112 - 1]
+// resolution: 1 / 2**112
+
+library UQ112x112 {
+    uint224 constant Q112 = 2**112;
+
+    // encode a uint112 as a UQ112x112
+    function encode(uint112 y) internal pure returns (uint224 z) {
+        z = uint224(y) * Q112; // never overflows
+    }
+
+    // divide a UQ112x112 by a uint112, returning a UQ112x112
+    function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
+        z = x / uint224(y);
+    }
+}