[PATCH] Override modules list and don't always load desktop-shell.so

[Bill Spitzak]

> 2013/4/16 Kristian Høgsberg <hoegsberg at gmail.com>:

>> I know the current behavior is a bit problematic for some use cases.
>> However it works well for the case where you load a plugin in addition
>> to the shell, like xwayland.  I'm not sure what the best way to make
>> both cases work is, except to make the shell plugin special.  We could
>> go back to use a shell config key and command line option and make
>> modules only about additional modules.

Would it be possible to load all the named modules, then find out if any 
of them are shells, and load the default shell if none are? Ie if the 
command line does not name a shell module you will get the default one.