Migrated to ical4android library (bitfireAT/davx5#302)

* Migrated to ical4android library

Signed-off-by: Arnau Mora <arnyminerz@proton.me>

* Manually excluded Groovy

Signed-off-by: Arnau Mora <arnyminerz@proton.me>

* Updated ical4android

Signed-off-by: Arnau Mora <arnyminerz@proton.me>

* Update dependencies

* Added more exclusions

Signed-off-by: Arnau Mora <arnyminerz@proton.me>

* Also update Room [skip CI]

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Signed-off-by: Arnau Mora <arnyminerz@proton.me>
Co-authored-by: Ricki Hirner <hirner@bitfire.at>