Improving the performance of the shared vision code.

[ipochto]

Andrettin:

I just made a change that resulted in the visibility-checking code becoming a lot faster when checking for visibility of a unit or tile instead of looping through ALL players and checking if each has shared vision with the "this" player and if they see the unit. I made shared vision be stored in the player instance as a set of player indexes. So then I just iterate over the other players the player actually has shared vision with. This is specially important for when moving the mouse, because when you move the mouse, it checks to see if ALL units are visible and on the viewport

https://github.com/Andrettin/Wyrmgus/commit/ac15658ec515cfc7bb8e723961d066a3a6cb17ae

[ipochto]

Fixed in master

[ipochto]

Performance improvements to shared vision checking Improved the performance of the radar visibility checking

[ipochto]

Fixed in master