[keycloak-dev] Deploy theme as module and simplified creating theme for embedding

I've introduce the concept of a theme packaged as a JAR. This makes it possible to deploy a theme as a module (which is nice for domain mode) and simplifies creating themes when KC is embedded into other projects. A theme JAR consists of: * META-INF/keycloak-themes.json A description of what themes are included in the jar * theme/<theme type>/<theme name> Templates, resources, etc as before Basically there's no longer any need to implement your own theme provider just to bundle a theme as a jar :) While doing this I realised that the structure of: * <theme type>/<theme name> Is wrong! It should be: * <theme name>/<theme type> Anyone have an objection to changing that? The reasoning is that it will be common to create a theme of different variants and having the theme name as the root makes it easier to copy to standalone/configuration/themes as well as groups everything for a theme into one place.