message: Mono: Update nwscript.cs.
diff: @@ -5938,7 +5938,7 @@ namespace NWN
  // Get the position of oTarget
  // * Return value on error: vector (0.0f, 0.0f, 0.0f)
  - public static NWN.Vector? GetPosition(NWN.Object oTarget)
  + public static NWN.Vector GetPosition(NWN.Object oTarget)
  {
  NWN.Internal.StackPushObject(oTarget, false);
  NWN.Internal.CallBuiltIn(27);
  @@ -7188,7 +7188,7 @@ namespace NWN
  }
  // Normalize vVector
  - public static NWN.Vector? VectorNormalize(NWN.Vector? vVector)
  + public static NWN.Vector VectorNormalize(NWN.Vector? vVector)
  {
  NWN.Internal.StackPushVector(vVector);
  NWN.Internal.CallBuiltIn(137);
  @@ -7248,7 +7248,7 @@ namespace NWN
  }
  // Create a vector with the specified values for x, y and z
  - public static NWN.Vector? Vector(float x = 0.0f, float y = 0.0f, float z = 0.0f)
  + public static NWN.Vector Vector(float x = 0.0f, float y = 0.0f, float z = 0.0f)
  {
  NWN.Internal.StackPushFloat(z);
  NWN.Internal.StackPushFloat(y);
  @@ -7265,7 +7265,7 @@ namespace NWN
  }
  // Convert fAngle to a vector
  - public static NWN.Vector? AngleToVector(float fAngle)
  + public static NWN.Vector AngleToVector(float fAngle)
  {
  NWN.Internal.StackPushFloat(fAngle);
  NWN.Internal.CallBuiltIn(144);
  @@ -8083,7 +8083,7 @@ namespace NWN
  }
  // Get the position vector from lLocation.
  - public static NWN.Vector? GetPositionFromLocation(NWN.Location lLocation)
  + public static NWN.Vector GetPositionFromLocation(NWN.Location lLocation)
  {
  NWN.Internal.StackPushLocation(lLocation);
  NWN.Internal.CallBuiltIn(223);
  @@ -11847,7 +11847,7 @@ namespace NWN
  // The database name IS case sensitive and it must be the same for both set and get functions.
  // The var name must be unique across the entire database, regardless of the variable type.
  // If you want a variable to pertain to a specific player in the game, provide a player object.
  - public static NWN.Vector? GetCampaignVector(string sCampaignName, string sVarName, NWN.Object oPlayer = null)
  + public static NWN.Vector GetCampaignVector(string sCampaignName, string sVarName, NWN.Object oPlayer = null)
  {
  NWN.Internal.StackPushObject(oPlayer, false);
  NWN.Internal.StackPushString(sVarName);
  