Merge pull request #2432 from CortexFoundation/dev

update tx gas limit cap

Author: ucwong

params/protocol_params.go

@@ -30,7 +30,7 @@ const (
 	MinerGasFloor        uint64 = MinGasLimit
 	MinerGasCeil         uint64 = 160000000
 
-	MaxTxGas uint64 = 30_000_000 // Maximum transaction gas limit after eip-7825.
+	MaxTxGas uint64 = 1 << 24 // Maximum transaction gas limit after eip-7825 (16,777,216).
 
 	MaximumExtraDataSize  uint64 = 32      // Maximum size extra data may be after Genesis.
 	ExpByteGas            uint64 = 10      // Times ceil(log256(exponent)) for the EXP instruction.