🔍Zoom out issues, on big maps

[cryham]

Especially on big maps like races-01..05 it's good to zoom out in game (mouse wheel), but:

• this zoom out value is reset to default on map restart/fail.
• there is player offset when zooming out, player is not in center (on screen)
• while zoomed out and far on right side of map, black empty are is visible (on screen)
• maybe also: big maps should have default zoom already set. I could set it even in .lua, no problem.

[cryham]

water particles are in wrong scaled place when zoomed out/in