Fix bug with xaos interpolation, by setting all xaos values to zero first.

Remove unnecessary resize() in Interpolate().

These are from Simon Detheridge's PR:

Set file name padding in EmberRender and
EmberAnimate based on the log10() of how many images are getting rendered, rather than hardcoding it to 5.

Use non-locale-imbued stream for writing filename in EmberAnimate.

Properly cast immediate float value used with pow() in density filter kernel.

Source/Ember/Interpolate.h

@@ -395,7 +395,6 @@ public:
 		vector<T> c(2);
 		Ember<T> localEmbers[4];
 		bool smoothFlag = false;
-		c.resize(2);
 
 		if (embers[0].m_Time >= time)
 		{