Improve elm_colorselector readability and fix clicked entry sig emission

Improve elm_colorselector readability and fix clicked entry sig emission

The reason for modifying about elm_colorselector can be "readability".
Each bar in the colorselector has its own color type (like hue, saturation,
...)
So I thought it will be better, if I added enum for each color type.

And, for about elm_entry.c , I thought that "SIG_CLICKED" was wrongly
emitted (by "MOUSE_UP" event).
I deleted mouse_up callback function (as you advised),
because this function didn't do anything by my modification.

By: WooHyun Jung <wh0705.jung@samsung.com>

SVN revision: 55097