Successful build - Chance fights ever on the side of the prudent.

Link to build: https://jenkins.wildfiregames.com/job/docker-differential/391/display/redirect

Ideally there would be no type conversions and all values are constructed in the right type, and the functions receiving them expect exactly that type.
I didnt check much of the code, but GetVertexGroundLevel expects the signed variant already, so it might be right with signed.
Should check that there arent unintented implicit type conversions.

Compile warning is gone.

m_MapSize ought to be signed but that sounded like it'd change many more lines.