--User changes

-Support 4k monitors, and in general, properly scale any monitor that is not HD.
 -Allow for a spatial filter of radius zero, which means do not use a spatial filter.
 -Add new variations: concentric, cpow3, helicoid, helix, rand_cubes, sphereblur.
 -Use a new method for computing elliptic which is more precise. Developed by Discord user Claude.
 -Remove the 8 variation per xform limitation on the GPU.
 -Allow for loading the last flame file on startup, rather than randoms.
 -Use two different default quality values in the interactive renderer, one each for CPU and GPU.
 -Creating linked xforms was using non-standard behavior. Make it match Apo and also support creating multiple linked xforms at once.

--Bug fixes
 -No variations in an xform used to have the same behavior as a single linear variation with weight 1. While sensible, this breaks backward compatibility. No variations now sets the output point to zeroes.
 -Prevent crashing the program when adjusting a value on the main window while a final render is in progress.
 -The xaos table was inverted.

--Code changes
 -Convert projects to Visual Studio 2017.
 -Change bad vals from +- 1e10 to +-1e20.
 -Reintroduce the symmetry tag in xforms for legacy support in programs that do not use color_speed.
 -Compiler will not let us use default values in templated member functions anymore.

Source/Ember/VarFuncs.h

@@ -186,6 +186,21 @@ public:
 		return static_cast<double>(temp);
 	}
 
+	/// <summary>
+	/// Integer hash function from http://burtleburtle.net/bob/hash/integer.html
+	/// </summary>
+	/// <param name="a">The value to hash</param>
+	/// <returns>The hashed value</returns>
+	static T Hash(int a)
+	{
+		a = (a ^ 61) ^ (a >> 16);
+		a = a + (a << 3);
+		a = a ^ (a >> 4);
+		a = a * 0x27d4eb2d;
+		a = a ^ (a >> 15);
+		return (T)a / std::numeric_limits<int>::max();
+	}
+
 	/// <summary>
 	/// Retrieve information about a piece of shared data by looking
 	/// up its name.