New modern icons and images system

[Ellypse]

One of the major backward breaking change I would like to have for the transition to the new BfA expansion is a new modern icons and images system, that would be more flexible and future-proof.

Using object oriented classes, the icons and images system would be defined by:

• texture path or texture ID
• coordinates to crop individual icons located inside sprites (like this one)
• categories (tags)
• have helper methods to apply the texture to a button, output as an escape sequence and maybe more.

Note: Maybe the base Object model of these will be in Ellyb