This adds support for a class power counter that has a visible recharge on the final "rune." Most power counters are either fully ready or full un-ready (where the recharge is hidden away), but Dragonriding's Vigor resource does show the recharge of the final point, which this now supports.
Child classes can support this by setting self.partialReady to the index of the rune that's partially ready, and self.partialReadyPercent to the percentage that that final rune is ready (0.0-1.0). If the partially-charged point uses a different texture, the child can also implement GetPartialRuneAtlas() and it will be used only for the partially-ready rune.
If we ever need to be able to show multiple partially-ready runes, this will need a small refactor.
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