Combine Awin Tap Variants

Based on !229 (comment 901717955)

There are 3 different Awin taps:

• https://github.com/ideavateltd/tap-awin - uses a deprecated API
• https://github.com/Horze-International/tap-awin-advertiser - uses the advertiser API
• https://github.com/gthesheep/tap-awin-publisher - uses the publisher API and the SDK, might eventually also use the advertiser API

We can combine these somehow, maybe removing the raw tap-awin and making that a variant of one of the others. Or put all of them under the tap-awin namespace and make tap-awin-publisher the default.