Issue #11058: Port GimpCellRendererColor to use GeglColor
This patch attempts to port GimpCellRendererColor to use GeglColor for its color column. This incidentally finishes the port away from GimpRGB in Colormap-Remap.c, which is the subject of issue #11058 (closed). This also affects GimpColorHexEntry (the dropdown that appears when you type names like "Blue" in the hex color field) and GimpDynamicsOutputEditor's Color section.
Edited by Alx Sa