--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/EmberGenome/EmberGenome.cpp

@@ -669,7 +669,7 @@ bool EmberGenome(EmberOptions& opt)
 						mutMeth = eMutateMode::MUTATE_NOT_SPECIFIED;
 					}
 
-					os << tools.Mutate(orig, mutMeth, vars, opt.Symmetry(), T(opt.Speed()), MAX_CL_VARS);
+					os << tools.Mutate(orig, mutMeth, vars, opt.Symmetry(), T(opt.Speed()), 8);
 
 					//Scan string returned for 'mutate color'.
 					if (strstr(os.str().c_str(), "mutate color"))
@@ -718,7 +718,7 @@ bool EmberGenome(EmberOptions& opt)
 				{
 					os << "random";
 					randomMode = true;
-					tools.Random(orig, vars, opt.Symmetry(), 0, MAX_CL_VARS);
+					tools.Random(orig, vars, opt.Symmetry(), 0, 8);
 					orig.m_FinalRasW = 1920;
 					orig.m_FinalRasH = 1080;
 					aselp0 = nullptr;