* [Blazor] Allows multiple components as entry points
* Removes all overloads that register a component statically with aborts
selector.
* Updates render component to have a RenderMode parameter that indicates
how the component must render. Valid values are Static, Server, and
ServerPrerendered.
* When using Server or ServerPrerendered we emit marker comments into
the page that are later used by blazor.server.js to bootrstrap a
blazor server-side application.
Javier Calvarro Nelson