Adding simple color picker

Left click colorpicker tool:
- Create PRIMARY/SECONDARY_COLOR_SELECTED/UPDATED events
- remove isPrimary arguments

js/drawingtools/ColorPicker.js

@@ -0,0 +1,25 @@
+/*
+ * @provide pskl.drawingtools.ColorPicker
+ *
+ * @require pskl.utils
+ */
+(function() {
+	var ns = $.namespace("pskl.drawingtools");
+
+	ns.ColorPicker = function() {
+		this.toolId = "tool-colorpicker";
+		this.helpText = "Color picker";
+	};
+
+	pskl.utils.inherit(ns.ColorPicker, ns.BaseTool);
+	
+	/**
+	 * @override
+	 */
+	ns.ColorPicker.prototype.applyToolAt = function(col, row, color, frame, overlay) {
+		if (frame.containsPixel(col, row)) {
+			var sampledColor = frame.getPixel(col, row);
+			$.publish(Events.PRIMARY_COLOR_SELECTED, [sampledColor]);
+		}
+	};
+})();