Use Google Turbo Color for Default Theme WF colors (#748)

* Use Google Turbo Color for Default Theme WF colors

* Added Default Jet Waterfall as the old WF color theme

* Oups duplicate IDs for widgets is wrong

src/util/Gradient.cpp

@@ -5,13 +5,25 @@
 #include <stddef.h>
 
 Gradient::Gradient() {
+	//nothing
+}
 
+void Gradient::clear() {
+	colors.clear();
 }
 
 void Gradient::addColor(GradientColor c) {
     colors.push_back(c);
 }
 
+void Gradient::addColors(const std::vector<GradientColor>& color_list) {
+
+	for (auto single_color : color_list) {
+
+		colors.push_back(single_color);
+	}
+}
+
 std::vector<float> &Gradient::getRed() {
     return r_val;
 }

src/util/Gradient.h

@@ -21,6 +21,10 @@ public:
 
     void addColor(GradientColor c);
 
+	void clear();
+
+	void addColors(const std::vector<GradientColor>& color_list);
+
     std::vector<float> &getRed();
     std::vector<float> &getGreen();
     std::vector<float> &getBlue();