#177 added the lock button to the internal frame of SlidableWMSServiceLayerGroup
#177 added field locked to SlidableWMSServiceLayerGroup. Also implemented basic functionality to lock the class if setLocked() is called
#177 changed the progress bar according to the locked-state of SlidableWMSServiceLayerGroup
#177 load the three properties from the newly created SlidableWMSServiceLayerGroup.properties
#177 reverse the order of the layers if the field ASCENDING is false
#177 added a timer to disable the slider after no new retrieval of the layers happened
#177 on selection of the layer in the Layer-Component, update the delay of the lockTimer due to the selected layer
#177 added the property resource-conserving and added default values for the properties
#177 do not lock SlidableWMSServiceLayerGroup if RESOURCE_CONSERVING is false
#177 change appearance of the slider a bit
#177 the locked status of SlidableWMSServiceLayerGroup and the enabled-state of the slider are now independent
#177 removed wrong slider.setEnabled(false)
#177 renamed field lockBeforeNextRetrieve to doNotDisableSlider. The slider is now always disabled on a new retrieval.
#177 repaint cismap if active layer was retrieved or if all layers were retrived
#177 stop the lockTimer before the retrieval of the layers
#177 draw labels in the slider vertically or horizontally, depending on the size of the slider
#177 added field allowMorphing
#177 restart timer in stateChanged()
#177 Override of SlidableWMSServiceLayerGroupJSlider.setEnabled()
#177 changed the disabled color of the vertical icons in SlidableWMSServiceLayerGroupJSlider to DARK_GRAY