Allow easier testing

[F43nd1r]

• allow mulitple init calls
• do not catch errors (especially AssertionErrors)

@mikehardy you might be interested in the ACRATest class, as it serves as an example on how to test reports.

[mikehardy]

Very interesting - I'm nowhere near ACRA-experienced enough to comment on the Throwable->Exception change but the multiple init and test example is useful, thank you! This may help shepherd ankidroid/Anki-Android#4893 through a merge if the primary maintainer there is hesitant, and then after it will help with a ReportLimiter integration as it shows more how to trigger ACRA programmatically. Much appreciated