Several usability improvements, especially for dragging mouse along colors #42
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No functional changes, just removed all whitespace at the end of each line.
The function was previously registering all events and selectively performing operations based on a stored state. Changed the behaviour to register and unregister relevant event listeners on specific occasions. This not only removes explicit state, but also grants more flexibility, which will be required for future changes.
Could not pinpoint why, but sometimes a native drag event triggers while sliding the mouse along the palette and suddenly the whole palette is being dragged with the mouse. This commit tries to negate this effect by adding a listener, that attempts to prevent the `dragstart` event.
It feels more robust if the dragging continues even if the mouse leaves the area that contains the drag listener. This makes it easier to pick colors near the edges (particularly near *two* edges, i.e. in the corners) For this to work, another listener had to be altered: the `mouseup` listener is now registered on document.body, instead of the drag area. It is also unregistered once the dragging is complete.
It is now possible to continue dragging along an edge, even if the mouse pointer is outside of the target area. This means that dragging along an edge or into a corner is now absolutely precise.
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I found several small issues while working with the pickers: The color picking process was stopping as soon the mouse pointer left the picker area, which made it very hard to choose colors on edges or corners.
I tried to provide several independent commits, each one just adding a small feature. I also aimed to retain compatibility with ancient IE versions without changing the API behavior.