imgUrl = {string} // path to an image - a source for color picking
pickerMaxSize = {[ number , number ]} // max width and height of the component
Optional:
roundness = {number} // border radius of the component
selectImgButton = {boolean} // if true, there will be a button for new image selection
onColorPicking = {function} // callback function which gets a color while picking
onColorPicked = {function} // callback function which gets a picked color
onColorPickedText = {string} // a text to display after a color is picked
showRGB = {boolean} // if true, a color's RGB value will be shown