Improve benchmarking and accurately measure weights

[gregdhill]

Listing all pallets that we should check weights of below:

• Our pallets
  • annuity (note: has WeightInfo config)
  • bitcoin (no extrinsics)
  • btc-relay (note: has WeightInfo config)
  • clients-info (note: has WeightInfo config)
  • collator-selection (note: has WeightInfo config)
  • currency (no extrinsics)
  • democracy (note: has WeightInfo config)
  • dex-general (note: has WeightInfo config)
  • dex-stable (note: has WeightInfo config)
  • dex-swap-router (note: has WeightInfo config)
  • escrow (note: has WeightInfo config)
  • farming (note: has WeightInfo config)
  • fee (note: has WeightInfo config)
  • issue (note: has WeightInfo config)
  • loans (note: has WeightInfo config)
  • nomination (note: has WeightInfo config)
  • oracle (note: has WeightInfo config)
  • redeem (note: has WeightInfo config)
  • replace (note: has WeightInfo config)
  • reward (no extrinsics)
  • security
  • staking (no extrinsics)
  • supply
  • traits (no extrinsics)
  • tx-pause (note: has WeightInfo config)
  • vault-registry (note: has WeightInfo config)
• External pallets with weight info:
  • frame_system
  • pallet_session: Run pallet-session benchmarks #1045
  • pallet_timestamp
  • pallet_utility
  • orml_vesting
  • pallet_preimage
  • pallet_scheduler
  • pallet_multisig
  • pallet_treasury
  • pallet_collective
  • pallet_membership
  • orml_tokens
  • orml_asset_registry
  • pallet_identity
  • pallet_proxy
  • orml_xtokens: Run orml-xtokens benchmarks #1046
  • pallet_xcm
  • cumulus_pallet_xcmp_queue
  • xcm_executor (e.g. Weigher type)