dde-launcher background #2588
Description
I think add options for background ir a good idea.
Point 1, if background is too brightness, ir very hard to ready name of apps, because text white in background semi white.
Point 2, for use in old PCs, like 1GB of RAM, if use background image, dde-launcher use 71 MB, but if set just one black pixel of wallpaper in deepin, dde-launcher use only 21 MB.
I think default effect of dde-launcher with 30% or 50% less brighness make, like dde-dock, see in image, right side is very hard to read in various monitors, but dde-dock is less brighness, if dde launcher use similar effect make better to read.
And add one option to disable background and use just a black background, maybe just enabled in dconf-editor or gconf, for use in old PCs with very low RAM.