Lua: send memory domain as an argument

[vadosnaprimer]

It always looks dirty when you have to change memory domains frequently since the game doesn't care and reads from a few of them in a row, and then you also must change it back to the domain you want.

I request ability to pass the needed memory domain as an optional parameter to memory.read/write() (and alike), the code will be way cleaner. Also, when there's only a single place where you need to use another domain, it's just easier to specify it directly than to add 2 more calls of usememorydomain just for that one case.

This obviously shouldn't change the global current region.