Fix DX9 bbox crash (DrawEngine::decoded wasn't initialized, because it also existed in the DX9 draw engine)
Move GetCurrentSimpleVertices to DrawEngineCommon
Clean up some indentation
D3D: Specify maxindex correctly in DrawIndexedPrimitive
DX9: Specify max index correctly
Really set maxindex correctly..
Reduce the diff between the two draw engines
More code deduplication. Also normalized some line endings.