Yieldmo prebid3.0 compliance, gdpr upadtes. remove openxoutstream bid…

…der (prebid#4485)

* update maintainer email

* add stringified schain

* Revert "add stringified schain"

This reverts commit 4fd8634.

* pass along gdpr consent string and gdpr applies through get

* use paramter gdprConsent

* add stringified schain

* don't change other files

* change parameter namves

* updates bidder module to be 3.0 compliant, and tests

* deletes openxoutstream adapter

* fix broken yieldmo test

* remove log

* remove utils functions that will be depricated in 3.0 and use new referer object in bidderRequest

* use prebids gettopwindow util functions. update markdown with 3.0 compliant ad units object

* Pass along us_privacy string

* add stringified schain

* add stringified schain

* Revert "add stringified schain"

This reverts commit 4fd8634.

* pass along gdpr consent string and gdpr applies through get

* use paramter gdprConsent

* don't change other files

* change parameter namves

* updates bidder module to be 3.0 compliant, and tests

* deletes openxoutstream adapter

* fix broken yieldmo test

* remove log

* remove utils functions that will be depricated in 3.0 and use new referer object in bidderRequest

* use prebids gettopwindow util functions. update markdown with 3.0 compliant ad units object

* Pass along us_privacy string