Center View and Music store integration

[Jeff Mitchell]

Bart Cerneels wrote:
> Now what is interesting is that, when implemented right, context and 
> music stores are just themes for the Center Pane. A reminder: Themes 
> control Widget that display data supplied by Scripts.
One thing I want to mention is that I think a more appropriate term is 
that display data, including music stores, would be supplied by 
Plugins.  I don't think we should limit ourselves to scripts, in 
whatever language; I think we should also try to allow compiled C++ 
plugins.  For many things they are faster (and for some things, like 
devices, they may be necessary).

As time permits I'm still slowly ironing out a proposal for a plugin 
system that would allow discovery of plugin capabilities, and even allow 
plugins to interact with each other.  Time is still short, until at 
least mid-March, and I am also finishing up the colored stars code for 
review (nearly there), but it is a priority since we're getting heavy 
into design and I hope to have something preliminary soon that can be 
ripped to shreds, more or less lovingly, by you all.

--Jeff