more direct access to characteristic data

Author: ccutrer

src/main/java/io/github/hapjava/characteristics/impl/base/EnumCharacteristic.java

@@ -137,4 +137,8 @@ public Integer getDefault() {
     }
     return 0;
   }
+
+  public T[] getValidValues() {
+    return validValues;
+  }
 }

src/main/java/io/github/hapjava/characteristics/impl/base/FloatCharacteristic.java

@@ -138,4 +138,16 @@ public void setValue(Double value) throws Exception {
   public Double getDefault() {
     return minValue;
   }
+
+  public double getMinValue() {
+    return minValue;
+  }
+
+  public double getMaxValue() {
+    return maxValue;
+  }
+
+  public double getMinStep() {
+    return minStep;
+  }
 }