Group albums into artists regardless of artist name capitalisation

[whimsicalities]

This discards capitalisation when making a list of AlbumArtists, stopping it from separating inconsistent artists into several AlbumArtists. It will still show the correct capitalisation on the display.
I also included the update to the glide version that was causing the build to fail.
closes #497 closes #491

[CLAassistant]

All committers have signed the CLA.

[timusus]

I'll have to review this one in depth, as I'm not sure what the consequences of this change are.

[pangteypiyush]

I second this. This will group artists like Tesseract (often stylized as TesseracT) into one.

[illdeletethis]

this would be a disadvantage if you are careful with your tagging, but have more than one artist with the same name that you are trying to order through different capitalization.
if added, this would be best to leave optional