API refactor, remove jboss-modules.

After refactoring and removing configurations, direct access to jboss-modues is no longer required (server doesn't instantiate new objects from strings).
But there are few things that I'm not completely satisfied.
Suggestions on how to change are welcome.

https://github.com/matejonnet/ceylon-sdk/blob/ceylon.net.httpd-no-mudule-loader/source/ceylon/net/httpd/WebEndpoint.ceylon#L5

called from:
https://github.com/matejonnet/ceylon-sdk/blob/ceylon.net.httpd-no-mudule-loader/source/ceylon/net/httpd/internal/CeylonRequestHandler.ceylon#L54

and
https://github.com/matejonnet/ceylon-sdk/blob/ceylon.net.httpd-no-mudule-loader/source/ceylon/net/httpd/WebEndpoint.ceylon#L10

Here also call could be done w/o switch
https://github.com/matejonnet/ceylon-sdk/blob/ceylon.net.httpd-no-mudule-loader/source/ceylon/net/httpd/internal/HttpRequestImpl.ceylon#L94