Add 64-bit reads/writes to tools that manipulate memory

[vadosnaprimer]

With lua this was impossible on 5.1 but 5.3 has 64-bit integers. Other tools like mem watch/search/hexeditor seem to always have been able to do this, but I guess low demand made it not happen.

In Doom a bunch of variables are 64-bit, and obviously in some other cores too, so it looks useful to extend the API.

[Morilli]

Which tools exactly is this targeting? Is this for the lua api only, or are there other apis that need 64-bit functions?

[vadosnaprimer]

Lua, mem watch/search, hexeditor. Basic bot I guess too.

Maybe there's some other tool where you can choose data size for addresses that I'm forgetting.