Custom slot for spectrum gloves

[Robotgiggle]

Unlike most glove trinkets added by other mods, Spectrum's gloves each represent a pair of gloves rather than a singular glove, and thus Spectrum only enables one of the two glove slots to put them in. This causes jank when another mod that enables both glove slots is installed, as the Spectrum gloves can only go in one of the two slots with no immediate indication as to why.

This PR solves the issue by creating a custom gloves slot for Spectrum's gloves to go in. Now that the gloves have their own dedicated slot, there will no longer be any confusion as to why they can only fit in one of the two identical glove slots used by most other mods, and their mutual exclusivity with each other is still maintained.

[DaFuqs]

That definitely solves the issue of being able to not equip spectrum gloves in the second glove slot. On the other hand it enables the player to equip spectrum gloves + two gloves by other mods, so they now wear three gloves with two hands.

Not sure that is necessarily better - maybe worse. Hmmmm