Always show global context shortcuts

[waldobronchart]

To quote a commenter on dpreview:

CC: For LR it would be great if the global buttons were available in the shortcut mapper for every module. For example I'm in the library module and want to know the short cut for crop, I should not have to go looking around for it, it's right there on the R key in the library module but with your system I need to bop over to the develop or global module to see how to crop from the library module. This would make the tool a better workflow aid (something to have up while using LR) instead of a learning module (Now I will learn the global keys, here is the map, now I will learn the develop keys, here is a map). Yeah, sorry for nit picking, really though I think this is great and thanks for nifty creation!