Continuous cleanup

[iower]

Remove unused code (in small steps)

• [x] Sum: SumSwap.ts, ...
• [x] listing
• [x] BINANCE_CHAIN_HTLC
• [x] helpers/nimiq.ts
• [x] core/swap.app/util/ignoreProps.ts
• [x] BCH (swap.auth/bch.ts, ....)
• [x] 'Footer/GetIeo'
• [x] remove IEO
• [x] Exchange/PureComponents/Advantages.*
• [x] Exchange/CurrencySlider.*
• [x] PointOfSell
• [x] FAQ.js (page) + pages/Exchange/FAQ/*
• [x] _BtcToGhost.tsx_, _EthTokenToUds.tsx_, _Ghost..., _Usdt...
• [x] Header/User
• [x] aboutUs: /pages/About '/aboutUs'
• [x] remove <Wrapper
• [x] router localisePrefix
• [x] relocalisedUrl
• [ ] remove prop-types (replace with TS)
• [x] referral referral.ts/newReferral
• [x] USDT2ETHTOKEN / ETHTOKEN2USDT
• [x] core/swap.swaps/UsdtSwap.ts (+ in index.ts), core/swap.swaps/usdt
• [x] links.ts - remove outdated links
• [x] handleCopyAddress (replace by <Copy>)
• [x] SubMenu components/Header/SubMenu
• [x] common/tests/tests.ts (?)
• [ ] skipFetchConfidence
• [ ] remove IPFS from docs
• [ ] front/SHARED/* -> front/* (remove /shared)
• [ ] CurrencyIcon.js -> Coin.js
• [ ] localisedUrl
• [ ] reputation
• [x] remove embed on website
• [ ] remove one-string files https://screenshots.wpmix.net/chrome_35YppotQFKgPUMQaSkU27VSda3nb5R1x.png
• [ ] new partial fulfilment request