wmstartup: Add more services, move service logic out of common.bash

.config/dtfscripts/services/polybar.dtf

@@ -11,10 +11,6 @@ service_name="Polybar"
 service_process="polybar"
 
 function start() {
-	if ! prestart; then
-		svc_log "Failed pre-start checks"
-		return 1
-	fi
 	export PB_MONITOR=$(xrandr -q | awk '/primary/{print $1}')
 	svc_log "Starting primary on monitor $PB_MONITOR"
 	polybar -r primary& > /dev/null 2>&1