* Update contract address validations in swaps for different networks
* Add support for direct contract swaps for wrapping and unwrapping
* Add WETH_RINKEBY_CONTRACT_ADDRESS
* Fix a check for EIP presense
* Add support for Polygon
* Update default Polygon URL
* Trigger Build
* Use a more user-friendly error message for disabled Swaps API calls
* Show custom tokens in Swaps
* Add messages for adding a custom token in Swaps
* Add the first version of importing custom tokens in swaps
* Fix lint rules
* Create a new component: ImportToken
* Remove a pointer cursor from regular heading
* Fix a CSS issue for tokens with long names
* Update a comment
* Don’t return a custom token if it doesn’t have symbol or decimals
* Only search by contract address if nothing was found
* Track “Token Imported” event
* Fix unit tests
* Import tracking for “Token Imported”, increase token icon font size
* Disable token import for Source Token
* Update logic and content for notifications, update tests
* Do not hide a dropdown placeholder on click, so a user can click on a link
* Update a key name
* Update styling for the “danger” type notification in Swaps
* Show either a warning or danger notification based on token verification occurences
* Remove testnets from SWAPS_CHAINID_DEFAULT_BLOCK_EXPLORER_URL_MAP
* Use the “shouldSearchForImports” prop
* Create a new function for handling token import: “onOpenImportTokenModalClick”
* Filter token duplicities before iterating over tokens
* Use “address” instead of “symbol” for checking uniqueness
* Trigger Build
* Use a new API (/token) to get token data for importing in Swaps
* Temporarily decrese Jest threshold for functions
* Use correct block explorer name and link in swaps when on custom network.
* Fix up custom etherscan link code in build-quote.js
* Use blockExplorerUrl hostname instead of 'blockExplorerBaseUrl'
* Use correct etherscan-link method for token links in build-quote
* Create correct token link in build-quote for mainnet AND custom networks
* Block explorer url improvements in awaiting-swap.js and build-quote.js
* Use swapVerifyTokenExplanation message with substitutable block explorer for all applicable locales
* Ensure that block explorer links are not shown in awaiting-swap if no url is available
* Swaps support for local testnet
* Create util method for comparison of token addresses/symbols to default swaps token
* Get chainId from txMeta in _trackSwapsMetrics of transaction controller
* Add comment to document purpose of getTransactionGroupRecipientAddressFilter
* Use isSwapsDefaultTokenSymbol in place of repeated defaultTokenSymbol comparisons in build-quote.js
