Increment SaveInventory::steps and fix state damage algo

[mateofio]

• Ticks when player moves with keyboard
• Ticks when plyaer moves with keyboard in a vehicle
• Does not tick for events forcing player movement
• Does not tick for moving once space to embark/disembark
• Tested and matches RPG_RT behavior

This counter ticks in RPG_RT and is stored in the save data, but outside of that it appears completely unused.

@CherryDT Is there anything we should be doing in the interpreter that depends on this?

[CherryDT]

No I think it's only for use in "change variable"

[mateofio]

In steam rm2k there is no option to set a variable to steps from the ChangeVariable dialog. It appears impossible to get at this value within a game. Maybe a bug in rm2k?

EDIT: Steam rm2k3 also does not support this feature in ChangeVariable.

[CherryDT]

You are right. That was my mistake. I confused it with RMXP which had this option.
RM2k(3) uses this value for the terrain poison feature.

EDIT: I'm talking only nonsense today. I meant the conditions which have field HP/MP reduction every X steps. Not terrains. X.x

[mateofio]

I see it now. RPG_RT has a very simple algorithm for computing damage steps related to states like Poison. It just does a modulus of the step count by the number of steps in the effect.

It has the benefit of making the start of the effect more random and the effect steps persist after a save game.

Right now in Player if you have a poison effect that triggers on every 4th step, you can save the game every 3 steps and never take poison damage.

[mateofio]

Tested this against RPG_RT and behavior matches. Ready to be reviewed and merged.

[Ghabry]

great, when I was discussing this with Sormat weeks ago we tried to figure out how RPG_RT saves this