Fixed bugs in volfeatures. See details.

Fixed some anticamp bugs.
Warning types confirmed working: chat, center, menu (minior bug: the warning text is item no. 2).
Fixed base event handler bugs.
Added validation warnings on anticamp intervals in case of invalid intervals.
Fixed volume states not properly cleaned up when players die or disconnect.

cstrike/addons/sourcemod/translations/zombiereloaded.phrases.txt

@@ -1104,6 +1104,12 @@
 	"Vol Slay"
 	{
 		"#format"	"{1:s},{2:d}"
-		"en"		"Player \"{1}\" has been slayed for camping in a restricted area (ID: {2})."
+		"en"		"Slayed player \"{1}\" for camping in a restricted area (ID: {2})."
 	}
-}
+	
+	"Vol Ignite"
+	{
+		"#format"	"{1:s},{2:d}"
+		"en"		"Ignited player \"{1}\" for camping in a restricted area (ID: {2})."
+	}
+}