util.time: New tiny library to abstract LuaSocket's gettime() function, so we can use other sources in the future

util/time.lua

@@ -0,0 +1,8 @@
+-- Import gettime() from LuaSocket, as a way to access high-resolution time
+-- in a platform-independent way
+
+local socket_gettime = require "socket".gettime;
+
+return {
+	now = socket_gettime;
+}