Support for cookies

[fireneat]

Please include cookie support. I am requesting this feature because one of my ICS calendars either requires cookies or responds with a 403 error. Here is the application's stack-trace:

HTTP 403 

java.io.IOException: HTTP 403 
	at at.bitfire.icsdroid.CalendarFetcher.fetchNetwork$icsx5_91_2_4_2_standardRelease(SourceFile:181)
	at at.bitfire.icsdroid.CalendarFetcher$fetchNetwork$1.invokeSuspend(Unknown Source:11)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(SourceFile:34)
	at kotlinx.coroutines.DispatchedTask.run(SourceFile:100)
	at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(SourceFile:124)
	at kotlinx.coroutines.scheduling.TaskImpl.run(SourceFile:89)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(SourceFile:586)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(SourceFile:820)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(SourceFile:717)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(SourceFile:704)

The following (censored, token removed) URL returns a 403 with the explanation "No cookies enabled" (can be seen with curl): https://ub-wuppertal.digibib.net/intro/ical/token, which 307 redirects to https://ub-wuppertal.digibib.net/intro/ical/token?require-cookie=true, which then responds with a 403 containing "This website requires the use of technical cookies, but no session cookie could be created in your browser." (translated from German).