Using space in keyboard shortcuts is case sensitive

[JudeLingan]

I tried to set Super+Space as the the keyboard shortcut for the launcher, but it wouldn't let me until I typed "Super+space" instead of "Super+Space". This is both difficult and inconsistent because "Super" is capitalized. I think that at the very least, all keys should be capitalized, but a better solution might just be to make everything case-insensitive. That way people don't run into as many issues.

[WatchMkr]

Our solution to this is being tracked here: #499

The plan is to capture modifiers like Super and Space automatically.