CHORE: bump version & prepare release 2.0.0rc9

DOCS: bump version & prepare 2.0.0rc8

CHORE: bump 2.0.0rc7 & prepare release

CHORE: bump version and prepare release 2.0.0rc6

DOCS: add external doc links

DOCS: bump 2.0.0rc4 and prepare for release

NEW: refactor expected os_type usage

for DRY

NEW: prepare Selene to work with wdm > 3.8.6

TEST: fix test to be crossplatform

FIX: tune dev status classifier