[App] Color; Replace overload with defaulted arg.

Applications/DataHolderLib/Color.cpp

@@ -18,11 +18,6 @@
 
 namespace DataHolderLib {
 
-Color createColor(unsigned char r, unsigned char g, unsigned char b)
-{
-    return Color{{r,g,b,255}};
-}
-
 Color createColor(unsigned char r, unsigned char g, unsigned char b, unsigned char a)
 {
     return Color{{r,g,b,a}};

Applications/DataHolderLib/Color.h

@@ -23,9 +23,10 @@ namespace DataHolderLib
 {
 using Color = std::array<unsigned char, 4>;
 
-Color createColor(unsigned char r, unsigned char g, unsigned char b);
-
-Color createColor(unsigned char r, unsigned char g, unsigned char b, unsigned char a);
+Color createColor(unsigned char r,
+                  unsigned char g,
+                  unsigned char b,
+                  unsigned char a = 255);
 
 /// Returns a random RGB colour.
 Color getRandomColor();