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This fixes inconsistent exception catching, and therefor fixes potential
uncaught exception while discovering/parsing, leading to std::terminate
being called

For reloads, like on regular app launch, we show notification only if
new media are parsed

This reverts commit fad767ac.

Load each content separately, to avoid wait before displaying the first
one

We keep 2 threads ready for reuse

Util method to check if an array contains an object

AppCompat version 25.2.0
ConstraintLayout version 1.0.0

Video layout doesn't change when screen is rotated on Android 2.3 when
usingOpenGLES 2. We could debug it but we don't want to loose time on Android
2.3 that will be dropped after the next release.