Changed DefaultRenderer._currentSubs to have Dialogue keys instead of their IDs.
Changed DefaultRenderer._currentSubs to have Dialogue keys instead of their IDs.

This fixes the use of the incorrect assumption that dialogue IDs are also their indices in ass.dialogues

Arnavion/libjass,joshuabrown-ellation/libjass,Arnavion/libjass,Dador/libjass,Arnavion/libjass,Dador/libjass,joshuabrown-ellation/libjass,Dador/libjass,joshuabrown-ellation/libjass