New HTML-UI plugin causes IMA/aditems to fail

[ivo-toby]

Players which have both IMA/aditems and html-ui don't show ads. There seems to be some timeout after which the player starts playing the content, not the ads.
Ads do play when no UI library or standardUI is used.

[Thomasvdam]

The issue here is that the html-ui doesn't have an ad ui implementation. There are several parts in this issue. I would propose moving the adWrapper to the GoogleIMA plugin instead of the core, adding an ad ui implementation to the html-ui default (or maybe IMA?), and moving hiding/displaying of ad UI to the IMA plugin.