Cleopatra DTL

[0xJem]

• Adds a DTL contract for Cleopatra V1 (== Uniswap V2)
• Adds a DTL contract for Cleopatra V2 (== Uniswap V3)
• Make the BaseDTL contract more generalisable by having a virtual function called to transfer the pool token (instead of requiring an ERC20 to be returned by _mintAndDeposit()
• Enable implementing BaseDTL contracts to disable linear vesting and validation checks
• Add a check that _onSettle() has not already been called

[Oighty]

Looks pretty good, but needs a few changes.

[0xJem]

Note: support for the veRAM token ID was initially included for Ramses V2, but later removed due to an inability to decipher the Ramses voting contracts. In particular, it was reverting in the Voting.attachTokenToGauge() function.