fnctl: add run command and fix env var handling (#211)

* fnctl: add run command and fix env var handling
* fnctl: fix help screens
* fnctl: address code review and fix logic mistake

fnctl/main.go

@@ -21,6 +21,7 @@ func main() {
 		apps(),
 		build(),
 		bump(),
+		call(),
 		lambda(),
 		publish(),
 		routes(),