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Adds ErrorProne, and fixes a couple of bugs:

• #133: fixes a crash with MobiusLoopViewModel
• #134: fixes a race and a deadlock situation with MobiusLoopController.
• #131: fixes an equals/hashCode violation in the UnrecoverableIncomingException implementations.

Improves the stability of a set of tests.

Fixes mostly bugs in tests, plus one race when disposing loops via #121.

Adds a new class, MobiusHooks, that enables configurable handling of programmer errors, via #119.

• Adds Android Architecture Components integration via #78, plus a couple of minor tweaks.
• Adds a QueueingEventSubject via #92
• Changes error logging, hoping to better support auto-deobfuscation via #105
• Adds support for RxJava version 3 via #101
• Adds better support for initial effects to RxMobius via #98

Bug fixes and tweaks, such as:

• Changes to the disposal mechanisms, via #76 and #95
• Fix an NPE when reporting some errors in the RxJava 2 integration via #96
• Changes to the signature and behaviour of MobiusLoopViewModel via #93
• Fixes a bug that broke backward compatibility with usage of Init functions in RxMobius-based loops, through #107
• Bumped Gradle (6.3) and Android Gradle Plugin (3.6.3)

Fixes a bug that broke backwards compatibility with usage of Init functions in RxMobius-based loops, through #107.

• changes error logging, hoping to better support auto-deobfuscation via #105
• adds support for RxJava version 3 via #101
• adds better support for initial effects to RxMobius via #98
• various minor bug fixes and tweaks

Bug fixes and tweaks, such as:

• changes to the disposal mechanisms, via #76 and #95
• fix an NPE when reporting some errors in the RxJava 2 integration via #96
• changes to the signature and behaviour of MobiusLoopViewModel via #93

• bumped some dependency versions
• added a QueueingEventSubject via #92