HTML5 Plugin "Errors" should be "Warnings" when building.

A bunch of APIs and Plugins are not supported on HTML5, which is fine. However, if we’re using these APIs/Plugins in our project then they should not lead to an error when building. Instead, give us warnings and build successfully. If that leads to an exception at runtime, that’s fine and on us. We can fix our logic to work around that.

However, I do find it terribly annoying that if I am switching between iOS/Android/HTML5 on builds I have to comment out/in a bunch of plugins and such in order to build successfully.