+ introduced "ismale"-attribute for humans

* humans can only mate with someone from the other sex
x bugfixing for Windows (FontRendering setting)
* some optimizations

Spielfigur.cs

@@ -1,4 +1,5 @@
-using System;
+using System;
+using System.Collections;
 
 namespace vampi
 {
@@ -6,7 +7,8 @@ namespace vampi
         protected Spielfeld sfeld;
         protected int typ;
         protected int maxAge = 80;
-        protected int age = -1;
+        protected int age = -1;
+
         public int Age {
             get { return this.age; }
         }
@@ -18,8 +20,8 @@ namespace vampi
         public Spielfigur(Spielfeld sfeld) {
             sfeld.Sfigur = this;
             this.sfeld = sfeld;
-        }
-
+        }
+
         public virtual void runStep() {
             if (this.age != -1) {
                 this.age++;
@@ -33,5 +35,4 @@ namespace vampi
             this.sfeld.Sfigur = null;
         }
     }
-
 }