Implement version detection for SMF

This can be tested [here](https://forum.pfsense.org/) or [here](https://forums.planetvampire.com/bloodlines-tech-support/)

src/apps.json

@@ -7196,6 +7196,7 @@
 			"env": "^smf_",
 			"icon": "SMF.png",
 			"implies": "PHP",
+                       "html": "credits/?\" title=\"Simple Machines Forum\" target=\"_blank\" class=\"new_win\">SMF ([0-9.]+)</a>\\;version:\\1",
 			"website": "http://www.simplemachines.org"
 		},
 		"SOBI 2": {