power: Add support for atlas textures

[p3lim]

No description provided.

[ls-]

LGTM 👌🏼

[p3lim]

This needs to revert to the previously used texture when switching back to not using an atlas, otherwise the atlas texture would be used for colors (e.g. switching between moonkin form and cat form as a balance druid).

Unsure if we want to cache the texture set on enable, or to provide an option to specify one. The former would be nicer for the user.

[p3lim]

Also think the option name should be more verbose, maybe colorPowerAtlas?

[ls-]

No. Why? It's on the .Power element. frame.Power.usePowerAtlas would be overly verbose.

[p3lim]

No. Why? It's on the .Power element. frame.Power.usePowerAtlas would be overly verbose.

Since this option is essentially the equivalent to coloring the status bar it makes sense that the option is named as such.

[ls-]

Since this option is essentially the equivalent to coloring the status bar it makes sense that the option is named as such.

Nah.

[ls-]

LGTM 👌🏼