clean up APICOntroller & new CacheController

* added a CacheController to hold all cache variables and clean up the APIController
* more consistent naming of variables
* update mensaMenu and courseList only if the request was successful

src/main/kotlin/org/mosad/thecitadelofricks/hsoparser/TimetableParser.kt

@@ -37,7 +37,7 @@ class TimetableParser {
      */
     fun getTimeTable(timetableURL: String): TimetableWeek {
         val timetableWeek = TimetableWeek()
-        val scheduleHTML = Jsoup.connect(timetableURL).get() // TODO add a tyr catch block to cover timeouts
+        val scheduleHTML = Jsoup.connect(timetableURL).get() // TODO add a try catch block to cover timeouts
 
         //val week = scheduleHTML.select("h1.timetable-caption").text()
         //println("$week successful!\n")