* Problem: state transition code is duplicated
Closes: #672
Solution:
- move gas refund out from ApplyMessage
- move check into ApplyMessage
- move evm construction into ApplyMessage
- ensure context stack is clean after ApplyMessage return
fix unit tests
undo rename
add underflow check
* improve performance
- don't duplicate params loading
- passing EVMConfig around as pointer
* add some unit tests for estimateGas
Also add some test environment setup, Closes#323
test estimateGas of erc20 token transfer
fix failed test case
the trick is to keep a clean transient store, by doing a commit
put artifacts to external file
* fix test failure
Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>
