Case-sensitivity toggle option for Collection

[paul4ts]

I find it annoying that the collection view is case-sensitive. This means certain artists are duplicated e.g. I have both "Rage Against The Machine" and "Rage Against the Machine" as separate artists. How about at least a case-sensitivity option to toggle this?

[jonas]

@paul4ts
I'm open to having a setting for enabling case-insensitivity, however someone else need to add it as I do not have time to prioritize it.

It should be possible by adding COLLATE NOCASE to the SQL queries in collectionquery.cpp