Fix inconsistencies in RecurrenceSet.

- Handle multi-line EXRULE and RDATE.
- Fix existing tests.
- Add more tests.

Fixes: 31054618
Test: adb shell am instrument -w com.android.calendarcommon2.tests/android.test.InstrumentationTestRunner
Change-Id: I73eb8dc876adb253e093d68685deefcc9b02953e
3 files changed