feat: small repo upgrade (#44)

In this PR:
* make contracts compatible with newer core (remove core-v2 references, add contract types)
* remove Aave and Compound price feeds
* move from `yarn` to `forge` Solidity dependencies management 
* bump `solc` version to `0.8.23`

---------

Co-authored-by: 0xmikko <26343374+0xmikko@users.noreply.github.com>

Author: lekhovitsky

.gitmodules

@@ -1,3 +1,16 @@
 [submodule "lib/forge-std"]
 	path = lib/forge-std
 	url = https://github.com/foundry-rs/forge-std
+[submodule "lib/@gearbox-protocol/core-v3"]
+	path = lib/@gearbox-protocol/core-v3
+	url = https://github.com/Gearbox-protocol/core-v3
+	branch = next
+[submodule "lib/@gearbox-protocol/sdk-gov"]
+	path = lib/@gearbox-protocol/sdk-gov
+	url = https://github.com/Gearbox-protocol/sdk-gov
+[submodule "lib/@1inch/solidity-utils"]
+	path = lib/@1inch/solidity-utils
+	url = https://github.com/1inch/solidity-utils
+[submodule "lib/@openzeppelin"]
+	path = lib/@openzeppelin
+	url = https://github.com/OpenZeppelin/openzeppelin-contracts

.vscode/settings.json

@@ -13,6 +13,6 @@
   "files.eol": "\n",
   "solidity.formatter": "forge",
   "solidity.packageDefaultDependenciesContractsDirectory": "contracts",
-  "solidity.packageDefaultDependenciesDirectory": "node_modules",
-  "solidity.compileUsingRemoteVersion": "v0.8.17"
+  "solidity.packageDefaultDependenciesDirectory": "lib",
+  "solidity.compileUsingRemoteVersion": "v0.8.23"
 }

contracts/interfaces/ILPPriceFeed.sol

@@ -1,19 +1,18 @@
 // SPDX-License-Identifier: MIT
 // Gearbox Protocol. Generalized leverage for DeFi protocols
-// (c) Gearbox Foundation, 2023.
-pragma solidity ^0.8.17;
+// (c) Gearbox Foundation, 2024.
+pragma solidity ^0.8.23;
 
-import {IPriceFeed} from "@gearbox-protocol/core-v2/contracts/interfaces/IPriceFeed.sol";
+import {IPriceFeed} from "@gearbox-protocol/core-v3/contracts/interfaces/base/IPriceFeed.sol";
 
-interface ILPPriceFeedEvents {
+/// @title LP price feed interface
+interface ILPPriceFeed is IPriceFeed {
     /// @notice Emitted when new LP token exchange rate bounds are set
     event SetBounds(uint256 lowerBound, uint256 upperBound);
 
     /// @notice Emitted when permissionless bounds update is allowed or forbidden
     event SetUpdateBoundsAllowed(bool allowed);
-}
 
-interface ILPPriceFeedExceptions {
     /// @notice Thrown when trying to set exchange rate lower bound to zero
     error LowerBoundCantBeZeroException();
 
@@ -29,10 +28,7 @@ interface ILPPriceFeedExceptions {
 
     /// @notice Thrown when price oracle's reserve price feed is the LP price feed itself
     error ReserveFeedMustNotBeSelfException();
-}
 
-/// @title LP price feed interface
-interface ILPPriceFeed is IPriceFeed, ILPPriceFeedEvents, ILPPriceFeedExceptions {
     function priceOracle() external view returns (address);
 
     function lpToken() external view returns (address);

contracts/interfaces/LICENSE

@@ -1,4 +1,4 @@
-(c) Gearbox Foundation, 2023.
+(c) Gearbox Foundation, 2024.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 

contracts/interfaces/aave/IWAToken.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: MIT
 // Gearbox Protocol. Generalized leverage for DeFi protocols
-// (c) Gearbox Foundation, 2023.
-pragma solidity ^0.8.17;
+// (c) Gearbox Foundation, 2024.
+pragma solidity ^0.8.23;
 
 interface IBalancerStablePool {
     function getRate() external view returns (uint256);

contracts/interfaces/balancer/IBalancerStablePool.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: MIT
 // Gearbox Protocol. Generalized leverage for DeFi protocols
-// (c) Gearbox Foundation, 2023.
-pragma solidity ^0.8.17;
+// (c) Gearbox Foundation, 2024.
+pragma solidity ^0.8.23;
 
 interface IBalancerVault {
     function getPoolTokens(bytes32 poolId)

contracts/interfaces/balancer/IBalancerVault.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: MIT
 // Gearbox Protocol. Generalized leverage for DeFi protocols
-// (c) Gearbox Foundation, 2023.
-pragma solidity ^0.8.17;
+// (c) Gearbox Foundation, 2024.
+pragma solidity ^0.8.23;
 
 interface IBalancerWeightedPool {
     function getRate() external view returns (uint256);

contracts/interfaces/balancer/IBalancerWeightedPool.sol

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+interface AggregatorInterface {
+    function latestAnswer() external view returns (int256);
+
+    function latestTimestamp() external view returns (uint256);
+
+    function latestRound() external view returns (uint256);
+
+    function getAnswer(uint256 roundId) external view returns (int256);
+
+    function getTimestamp(uint256 roundId) external view returns (uint256);
+
+    event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 updatedAt);
+
+    event NewRound(uint256 indexed roundId, address indexed startedBy, uint256 startedAt);
+}

contracts/interfaces/chainlink/AggregatorInterface.sol

@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import "./AggregatorInterface.sol";
+import "./AggregatorV3Interface.sol";
+
+interface AggregatorV2V3Interface is AggregatorInterface, AggregatorV3Interface {}