v1.9.0-alpha13

This is an Alpha 13 release of the upcoming OpenNox v1.9.0.

New

• ns4.Object.Damage() now returns result (if damage was dealt or not).

Fixes

• Monsters always fire north when instructed by a script (#658, #657)
• Objects open containers on contact (#659)
• Crash when casting a spell higher than level 5 (#656)
• Crash when hovering mouse over incomplete items (#655)
• Fix crash in dedicated server mode
• Fixed two other crashes