Reduce the fee to a maximum of 20 GAS

[shargon]

As we commented here #1430 (comment)

If we reduce the Max fee to 20 of GAS, we can use integer instead of long.

Taking into account:

• We can save 8 bytes in all transactions, 4 if we decide to join the fees.
• If we have plans to increate the decimals in the future, we should increase to long again

What do you think?

Draft: #1460

[vncoelho]

I agree with both.

[erikzhang]

I agree to reduce the max fee to 20 of GAS and use int instead of long.

[Tommo-L]

Agree.

4 if we decide to join the fees.

I think we can wait until the economic model is decided.

[shargon]

@Tommo-L do you think that it's a good change after study the cost of Defi?

[erikzhang]

I think it's good because the price of each opcode is much lower in neo3 then neo2.

[erikzhang]

I think it's good because the price of each opcode is much lower in neo3 then neo2.