core.R: Add colorMode specific constants (#191)

Signed-off-by: Ce Gao <ce.gao@outlook.com>

Author: gaocegege

src/rprocessing/applet/BuiltinApplet.java

@@ -83,26 +83,6 @@ public void noiseDetail(double lod, double falloff) {
     super.noiseDetail((int) lod, (float) falloff);
   }
 
-  public void colorMode(double mode) {
-    this.logWarningsforCast();
-    super.colorMode((int) mode);
-  }
-
-  public void colorMode(double mode, float max) {
-    this.logWarningsforCast();
-    super.colorMode((int) mode, max);
-  }
-
-  public void colorMode(double mode, float max1, float max2, float max3) {
-    this.logWarningsforCast();
-    super.colorMode((int) mode, max1, max2, max3);
-  }
-
-  public void colorMode(double mode, float max1, float max2, float max3, float maxA) {
-    this.logWarningsforCast();
-    super.colorMode((int) mode, max1, max2, max3, maxA);
-  }
-
   public double getPI() {
     return PI;
   }

src/rprocessing/r/core.R

@@ -285,3 +285,8 @@ CONTROL = RLangPApplet$CONTROL
 SHIFT = RLangPApplet$SHIFT
 
 print = stdout$print
+
+RGB = RLangPApplet$RGB
+ARGB = RLangPApplet$ARGB
+HSB = RLangPApplet$HSB
+ALPHA = RLangPApplet$ALPHA