feat: Gas optimizations, style fixes, minor fixes

[QEDK]

• Allows hardhat to work without local variables by fixing the RPC config
• Removes zero checks that consume gas
  • It is cheaper to do 0 ETH transfers than redo a reverted tx
  • Makes it more expensive for correct txs
• Optimize uint256 total logic for ETH, we can do it in-loop
• Conform event names to Solidity style guide (CapWords)
• Bump compiler to latest Solidity and more opt runs
• No change in hardhat_contracts.json