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

.config/dtfscripts/services/sxhkd.dtf

@@ -10,10 +10,7 @@ source $DTF_SERVICES_DIR/common.bash
 service_name="sxhkd"
 service_process="sxhkd"
 
-function prestart() {
-	if ! which $service_process > /dev/null 2>&1; then
-		svc_log "Could not find process"
-	fi
+function prestart-extra() {
 	if ! pgrep bspwm > /dev/null 2>&1; then
 		svc_log "Not under bspwm"
 		return 1