Notable: artifact id is 4 bytes now but NOT EVERYWHERE
A lot of simple objects now have parameters, check MapVisitableWithReward read/write logic (it is a mess + hota have garbage random bytes there);
New parameters in events (global, local and twon), pandoras, filed in heroes and new array probably utilized by camp maps after custom heroes array.
I finished 1.7 map support in FreeHeroes master: https://github.com/mapron/FreeHeroes
You can check all commits with 'Hota 1.7 there'
Notable: artifact id is 4 bytes now but NOT EVERYWHERE A lot of simple objects now have parameters, check MapVisitableWithReward read/write logic (it is a mess + hota have garbage random bytes there); New parameters in events (global, local and twon), pandoras, filed in heroes and new array probably utilized by camp maps after custom heroes array.
Good luck!