Adjust map position rounding to match RPG_RT behavior

[mateofio]

In RPG_RT, The function SetMapPosition(map, x, y) (equvalent to our MoveTo()) does not round the character X and Y position, instead it sets them event if they are out of bounds, and then later code in moving, vehicle boarding, collision etc.. does the rounding.

In player, we set x and y in MoveTo().

Investigate these differences and modify our code to be compliant, identify any game visible bugs arising from this and test them.

DynRPG addresses

Addr	Name
004C43A8	Character::SetMapPosition
004A8AEC	Hero::SetMapPosition
004A8528	Map::RoundX
004A8568	Map::RoundY

[Ghabry]

The only case I know where this is relevant is for Pictures. When they are locked to the map they are only shown at the instance of the map where they were created. When you loop the map it dissapears (until you move the same amount of loops back)

[mateofio]

There are also edge cases which setting the player position using variable which are out of bound. Handling looping properly for movement and boarding vehicles, etc.. Also save game chunk compatibility for all these.

I'm like 98% sure we already do it all correctly, but given the difference in underlying code structure, maybe there is an edge case bug where we don't match RPG_RT somehow.