Set of smaller token related improvements

[modersohn]

• token details page
  • use failSafeSymbol in case symbol is empty so "Token {id}" is displayed
  • show token address with link to etherscan to check the contract
• adapt pool token naming convention so they match that of the contracts
  • i.e. name = AMM-x-y, symbol = LP-x-y
• refactored TimestampConverter.ToUTCTime() as suggested on discord

[fudgebucket27]

Fine by me mate!