Fixes grow on trees (#458)

- Made the download command easier to use with less errors than before
- Usage is now `/iris download <repo> [branch=master]`
- Fixed multiplicitive being useless in noise generators

src/main/java/com/volmit/iris/engine/object/IrisGenerator.java

@@ -50,7 +50,6 @@ public class IrisGenerator extends IrisRegistrant {
     @Desc("The opacity, essentially a multiplier on the output.")
     private double opacity = 1;
 
-
     @Desc("Multiply the compsites instead of adding them")
     private boolean multiplicitive = false;
 
@@ -80,12 +79,10 @@ public class IrisGenerator extends IrisRegistrant {
     private double offsetZ = 0;
 
     @Required
-
     @Desc("The seed for this generator")
     private long seed = 1;
 
     @Required
-
     @Desc("The interpolator to use when smoothing this generator into other regions & generators")
     private IrisInterpolator interpolator = new IrisInterpolator();
 
@@ -227,12 +224,11 @@ public class IrisGenerator extends IrisRegistrant {
         }
 
         int hc = (int) ((cliffHeightMin * 10) + 10 + cliffHeightMax * seed + offsetX + offsetZ);
-        double h = 0;
-        double tp = multiplicitive ? 1 : 0;
+        double h = multiplicitive ? 1 : 0;
+        double tp = 0;
 
         for (IrisNoiseGenerator i : composite) {
             if (multiplicitive) {
-                tp *= i.getOpacity();
                 h *= i.getNoise(seed + superSeed + hc, (rx + offsetX) / zoom, (rz + offsetZ) / zoom);
             } else {
                 tp += i.getOpacity();

src/main/java/com/volmit/iris/engine/object/IrisNoiseGenerator.java

@@ -23,6 +23,7 @@ import com.volmit.iris.engine.interpolation.IrisInterpolation;
 import com.volmit.iris.engine.noise.CNG;
 import com.volmit.iris.engine.object.annotations.ArrayType;
 import com.volmit.iris.engine.object.annotations.Desc;
+import com.volmit.iris.engine.object.annotations.MaxNumber;
 import com.volmit.iris.engine.object.annotations.MinNumber;
 import com.volmit.iris.engine.object.annotations.Required;
 import com.volmit.iris.util.collection.KList;
@@ -48,6 +49,7 @@ public class IrisNoiseGenerator {
     private boolean negative = false;
 
     @MinNumber(0)
+    @MaxNumber(1)
     @Desc("The output multiplier")
     private double opacity = 1;
 
@@ -56,7 +58,7 @@ public class IrisNoiseGenerator {
     private double offsetX = 0;
 
 
-    @Desc("Height output offset y")
+    @Desc("Height output offset y. Avoid using with terrain generation.")
     private double offsetY = 0;
 
 
@@ -64,7 +66,6 @@ public class IrisNoiseGenerator {
     private double offsetZ = 0;
 
     @Required
-
     @Desc("The seed")
     private long seed = 0;