res:dock:: try to fix multi systray and wrong orders
res:launcher/dock:: launcher background, dock position.

1. encoding launcher background uri.
2. add initDockedAppPosition() to Added handler.
lib:dbus  use gio/gdbus rewrite to solve  c-low-dbus message handle limit
greeter:version add Alpha
Merge branch 'develop' of github.com:linuxdeepin/dde into develop
lib:dbus fix zero length Array's type
res:dock:: fix the drag image is cut.
res:launcher:: fix header decorations are not the same width.
greeter:fix bug of lock-->switchtogreeter->and login will died
Merge branch 'develop' of github.com:linuxdeepin/dde into develop
lib:dbus improve error handle
res:launcher:: fix dock will not shown when any item is dragged on launcher
lib:dbus fix struct panic
res:dock:: fix trash cannot drag and drop
res:dock:: fix trash icon is not changed.

the change is not smoothing.
res/app:dock:: clean code
res:launcher:: add title for uninstalling dialog
lib: add background helper
res/dock:: clean code, move to dde-daemon
greeter:setBackground in greeter.c and lock.c; coffee only make animation background