--User changes

-Better handling of crossed min/max DE filter values on the GUI.
 -Changes to spatial and density filter values will no longer restart the entire render.
 -Support reading cam_zoom from xml as zoom since JWildfire uses cam_zoom.
 -Change drag n drop behavior: the default is now to append, hold Ctrl to overwrite.
 -Set max value of zoom to 25 because it will crash with values around 28 or 29 due to numeric overflow when scaling quality.
 -Update links in About Dialog.
 -Rename some controls in Options Dialog.
 -Move the color curves control to the Palette tab.

--Bug fixes
 -Remove extra space in info tree text when dealing with a linked xform.
 -Update summary xform name field whenever xform name changes.
 -Get rid of selection border on summary tab xform tree cells.
 -Only add variations from Xml that have a non-zero weight. There seemed to be spurious flattens coming from Apo with a weight of 0.

--Code changes
 -Gutters are now a fixed size of 8 * supersample.
 -Use stl data() member to get pointer to first element instead of &vec[0].
 -Eliminate extra calls in renderer to ComputeBounds(), CreateSpatialFilter() and CreateTemporalFilter() to only be done at the start of a render.
 -Another attempt at vectorizing LogScaleDensityFilter(). Vectorizes, but not sure if it helps.
 -Some other loop optimizations in Renderer.
 -No longer check temporal samples in response to some control changes, they are always 1 in the interactive renderer.

Source/Ember/Iterator.h

@@ -68,7 +68,7 @@ public:
 	/// <summary>
 	/// Accessors.
 	/// </summary>
-	const byte* XformDistributions() const { return m_XformDistributions.empty() ? nullptr : &m_XformDistributions[0]; }
+	const byte* XformDistributions() const { return m_XformDistributions.empty() ? nullptr : m_XformDistributions.data(); }
 	size_t      XformDistributionsSize() const { return m_XformDistributions.size(); }
 
 	/// <summary>
@@ -308,9 +308,9 @@ public:
 		Point<T> tempPoint, p1;
 		auto xforms = ember.NonConstXforms();
 
-		if (ember.ProjBits())
+		if (ember.ProjBits())//No xaos, 3D.
 		{
-			if (ember.UseFinalXform())
+			if (ember.UseFinalXform())//No xaos, 3D, final.
 			{
 				p1 = samples[0];
 
@@ -332,7 +332,7 @@ public:
 					ember.Proj(samples[i], rand);
 				}
 			}
-			else
+			else//No xaos, 3D, no final.
 			{
 				p1 = samples[0];
 
@@ -355,9 +355,9 @@ public:
 				}
 			}
 		}
-		else
+		else//No xaos, no 3D.
 		{
-			if (ember.UseFinalXform())
+			if (ember.UseFinalXform())//No xaos, no 3D, final.
 			{
 				p1 = samples[0];
 
@@ -377,7 +377,7 @@ public:
 					DoFinalXform(ember, p1, samples + i, rand);
 				}
 			}
-			else
+			else//No xaos, no 3D, no final.
 			{
 				p1 = samples[0];
 
@@ -475,9 +475,9 @@ public:
 		Point<T> tempPoint, p1;
 		auto xforms = ember.NonConstXforms();
 
-		if (ember.ProjBits())
+		if (ember.ProjBits())//Xaos, 3D.
 		{
-			if (ember.UseFinalXform())
+			if (ember.UseFinalXform())//Xaos, 3D, final.
 			{
 				p1 = samples[0];
 
@@ -506,7 +506,7 @@ public:
 					lastXformUsed = xformIndex + 1;//Store the last used transform.
 				}
 			}
-			else
+			else//Xaos, 3D, no final.
 			{
 				p1 = samples[0];
 
@@ -536,9 +536,9 @@ public:
 				}
 			}
 		}
-		else
+		else//Xaos, no 3D.
 		{
-			if (ember.UseFinalXform())
+			if (ember.UseFinalXform())//Xaos, no 3D, final.
 			{
 				p1 = samples[0];
 
@@ -565,7 +565,7 @@ public:
 					lastXformUsed = xformIndex + 1;//Store the last used transform.
 				}
 			}
-			else
+			else//Xaos, no 3D, no final.
 			{
 				p1 = samples[0];