wmaker: moved the code for the bg helper to a dedicated function
In order to make code easier to maintain, the code related to creating the
Helper process (which helps by setting the background of the workspace) is
moved to a dedicated function, which have been moved to the same location
as the function for communicating with the helper.
Took opportunity to de-CamelCase the related names.
Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
Signed-off-by: Carlos R. Mafra <crmafra@gmail.com>