Add icon custom width and height

[Soothx]

WowT_zXR8B2bC8E.mp4

[Lyamir]

any update on this? Also, what else is missing for this PR to be put as open and approved?

[Soothx]

any update on this? Also, what else is missing for this PR to be put as open and approved?

It is a draft, as this was just an initial implementation I did, but it has a couple of drawbacks, such as default Blizzard glows showing as a 1 by 1 square, until the initial animation is over. Other than that, it also needs to be optimized to reduce the number of calls to the calculate texcoords function, as swapping specs lags the game out for a solid 2+ seconds.

@DaleHuntGB said he will work on custom glows when he gets to it, and part of that is custom width/height implementation. This branch is basically just a reference for him to look at.

I'm personally using this branch since it works fine outside of the spec swapping, and I can live with the animation being weird for 200ms.