Fix for fetcher warning at server startup (prebid#1914)

Co-authored-by: Veronika Solovei <[email protected]>

Rubicon: Fix Nil Reference Panic (prebid#1918)

New Adapter: Axonix (prebid#1912)

* New Axonix adapter

* Changed endpoint

* Rename adapter type

* Leave in examplary only the basic test fixtures

* PR comments

IX: merge eventtrackers with imptrackers for native bid responses (pr…

…ebid#1900)

Outbrain adapter: overwrite tagid only if it exists (prebid#1895)

Pubmatic: Sending GPT slotname in impression extension (prebid#1880)

Debug override header (prebid#1853)

Facebook: Drop consented providers (prebid#1867)

Update go-gdpr package to v0.9.0 (prebid#1856)

Add Viewdeos alias (prebid#1846)