Remove licensing code completely

[luismbo]

Although a proper license is no longer required, it is still necessary to go through the registration dialog, the windows registry is still modified, and licensing information show up in various parts of the IDE.

[binghe]

Note: the registration dialog is absolutely not necessary as a open source software, but currently certain facility (like Save Application) need to detect if current Lisp environment is fully registered (otherwise the related function cannot work), so disabling the registration dialog is not a full solution, all related feature-checking code at Lisp side must be detected and removed too.

[arbv]

Registration code and license.dll were removed from the project.