Adds feature to generate ICS file to add to calendar

[stagrim]

Adds button to create an ICS file using a self created iCalendar library, written in Scala.js. Also adds a checkbox to display times with or without "akademisk kvart", which in turn will carry over to the generated ICS file. I have tested generated ICS files, but bugs may still occur.

Please rearrange or style the new UI elements if you have a better idea of how they can be displayed. The same goes for the code itself, if you find a better way of doing things, please contribute.

[stagrim]

This looks good! Great work creating your own? ICal builder in Scala.

The iCalendar library is built from the ground up. It also contains code specifically made for kapten-alloc-web, like the functions in the Property companion object used to create Property classes from kapten-alloc data. More features from the iCalendar standard will be added when they are needed. Currently only features that are needed are implemented. I plan, for example, on adding support for alerts like my Rust version (plan was to use Rust-generated WebAssembly in kapten-alloc-web, but it would have made project more complex to maintain). In that case a new class, Alert, which inherits from VObject would be created, and a VObject vector in Event etc. It is build to be (hopefully) scalable, like to easily add new Parameters, Properties and such.

https://github.com/bjornregnell/kapten-alloc-web/pull/4#discussion_r753944572 Should be resolved with the 31c8b2d commit

Thanks for the review!

[bjornregnell]

This seems really useful @stagrim ! Happy coding :smile:
I will take a look hopefully by the end of this week after my lectures if not before.

@theolundqvist thanks for the review! Would be great if you meanwhile also could try to build it locally and perhaps do some quick testing and check the user experience?

@DagHemberg You also expressed interest in this previously. If you have some time over, you are welcome to give it a review if you like.

[bjornregnell]

I get this build error after merge:

sbt:hello Scala.js> fullLinkJS
[info] Full optimizing /home/bjornr/git/hub/bjornregnell/kapten-alloc-web/target/scala-3.1.0/hello-scala-js-opt
[error] file:/home/runner/work/scala-java-time/scala-java-time/core/js/target/scala-3.0.0/src_managed/main/org/threeten/bp/format/DateTimeFormatterBuilder.scala(1536:4:Labeled): any expected but <notype> found for tree of type org.scalajs.ir.Trees$Block
[error] There were 1 IR checking errors.
[error] (Compile / fullLinkJS) There were 1 IR checking errors.

Seems to be a clash between Scala versions (?)