separate script variable for selling price

[meszaros-lajos-gyorgy]

Is it possible to add a new variable for price? (sell only), for example in scripts we have SET_PRICE for buying and selling, but I would like the sale from shop keepers to be independent of the purchase value, this to better balance the trade in arx, since even with a very low intuition, trade is still very broken, this so that you can get money or buying things more interesting, the player would give more importance to decisions when buying. You could also just reduce sales profit in the source code without adding a new variable to scripts, well it's just a query

[meszaros-lajos-gyorgy]

Small note: this also alters the save format and makes these changes incompatible with vanilla arx: https://github.com/arx-insanity/ArxLibertatis/blob/master/src/scene/SaveFormat.h#L893

[meszaros-lajos-gyorgy]

buying an item from a shop: SecondInventoryHud::dragEntity() -> calls ARX_INTERACTIVE_GetPrice() selling an item to a shop: SecondaryInventoryHud::dropEntity -> calls ARX_INTERACTIVE_GetSellValue()

[meszaros-lajos-gyorgy]

The changes so far that are important:

• save format now has an additional s32 field for storing an item's sell price
• added ^buyprice and ^sellprice global script variables (float)
• ^price global script variable is kept as is for compatibility, returns the buyPrice of an item
• the setprice command sets both buy and sell prices with the same value (still expects one numeric argument)
• added setbuyprice and setsellprice to allow setting buy and sell prices separately

[meszaros-lajos-gyorgy]

one more todo left: need to look at all the places where ->buyPrice is being set and need to check if ->sellPrice also needs to be set

[meszaros-lajos-gyorgy]

in review

[meszaros-lajos-gyorgy]

merged into insanity branch