Update compliments with support for cron type date/time for selections, addition to just date. (#3481)

> - What does the pull request accomplish? Use a list if needed.

this change allows uses to configure date/time events for compliments..
also linked site that will build the cron entry..

and example was Happy hour in a pub, on fri/sat between 5 and 7 pm. 

or just after midnight on Halloween (Boooooo!)

I also added testcases for #3478 

(and added support for this in MMM-Config), with a custom, drop down
selection list of the types.. )

|  if this is approved I will update the module doc

tests/configs/modules/compliments/compliments_cron_entry.js

@@ -0,0 +1,18 @@
+let config = {
+	modules: [
+		{
+			module: "compliments",
+			position: "middle_center",
+			config: {
+				specialDayUnique: true,
+				compliments: {
+					anytime: ["just a test"],
+					"00-10 16-19 * * fri": ["just pub time"]
+				}
+			}
+		}
+	]
+};
+
+/*************** DO NOT EDIT THE LINE BELOW ***************/
+if (typeof module !== "undefined") { module.exports = config; }