Create ftoptions option to disable auto settings

Closes #662

runtime/plugins/ftoptions/ftoptions.lua

@@ -1,9 +1,17 @@
+if GetOption("ftoptions") == nil then
+    AddOption("ftoptions", true)
+end
+
 function onViewOpen(view)
+    if not GetOption("ftoptions") then
+        return
+    end
+
     local ft = view.Buf.Settings["filetype"]
 
     if ft == "makefile" or ft == "go" then
         SetOption("tabstospaces", "off")
-    elseif ft == "python" then
+    elseif ft == "python" or ft == "python2" or ft == "python3" then
         SetOption("tabstospaces", "on")
     end
 end