[adaptive_detector] Fix first scene not being checked against min_sce…

…ne_len

Refactor detector test cases to make it easier to add new ones.

[build] Build signed Windows binaries for v0.6.2.

[release] Release v0.6.1.

[bugfix] Fix broken distribution when PyAV is unavailable.

[build] Fix missing dependency for format checker.

Prepare v0.6 release candidate.

[docs] Prepare v0.6-dev3 release.

[release] 0.6-dev2

v0.5.6.1 release.

Merge branch 'v0.5.6'