Implemented dynamic IGO for #1796

[poshdan]

Please check migration numbers before merging

PR Description

Based on ticket #1796
Implements a lightweight if-clause to distribute IGO.
Previously we would not do an if check in the else branch and would incur a hefty gas cost of modifying the user's IGO value to itself (you still pay extra even if the number doesn't change)
This solution makes very little impact but saves a LOT of gas when it's set to 0 and allows us to have different gas impact per-network.

Operating the feature is same as before, modifying var 28 on the cryptoblades contract.

Testing

Tested locally

Before if clause
win 103217 << extra cost for writing earnings on character for first time
win 87645 << real value to compare
After if clause, 0 amount
win 87883
win 87883
After if clause, non-0 amount
win 110433 << extra cost for taking user's IGO amount from 0 to non-0
win 95297 << consecutive gas cost compared to above for updating IGO number

Seems only 238 gas cost for the if clause. That's very negligible even at BNB ATH.