add reading single file into one string (used for importing json)

functions.lua

@@ -127,3 +127,15 @@ basic_functions.import_settingtype = function(infile)
 		end
 	end
 end
+
+basic_functions.read_file=function(filename)
+	local file=io.open(filename,"r")
+	out=""
+	if file then
+		for line in file:lines() do
+			out=out..line
+		end
+		file.close()
+	end
+	return(out)
+end