--User changes

-Add a palette editor.
 -Add support for reading .ugr/.gradient/.gradients palette files.
 -Allow toggling on spinners whose minimum value is not zero.
 -Allow toggling display of image, affines and grid.
 -Add new variations: cylinder2, circlesplit, tile_log, truchet_fill, waves2_radial.

--Bug fixes
 -cpow2 was wrong.
 -Palettes with rapid changes in color would produce slightly different outputs from Apo/Chaotica. This was due to a long standing bug from flam3.
 -Use exec() on Apple and show() on all other OSes for dialog boxes.
 -Trying to render a sequence with no frames would crash.
 -Selecting multiple xforms and rotating them would produce the wrong rotation.
 -Better handling when parsing flames using different encoding, such as unicode and UTF-8.
 -Switching between SP/DP didn't reselect the selected flame in the Library tab.

--Code changes
 -Make all types concerning palettes be floats, including PaletteTableWidgetItem.
 -PaletteTableWidgetItem is no longer templated because all palettes are float.
 -Include the source colors for user created gradients.
 -Change parallel_for() calls to work with very old versions of TBB which are lingering on some systems.
 -Split conditional out of accumulation loop on the CPU for better performance.
 -Vectorize summing when doing density filter for better performance.
 -Make all usage of palettes be of type float, double is pointless.
 -Allow palettes to reside in multiple folders, while ensuring only one of each name is added.
 -Refactor some palette path searching code.
 -Make ReadFile() throw and catch an exception if the file operation fails.
 -A little extra safety in foci and foci3D with a call to Zeps().
 -Cast to (real_t) in the OpenCL string for the w variation, which was having trouble compiling on Mac.
 -Fixing missing comma between paths in InitPaletteList().
 -Move Xml and PaletteList classes into cpp to shorten build times when working on them.
 -Remove default param values for IterOpenCLKernelCreator<T>::SharedDataIndexDefines in cpp file.
 -Change more NULL to nullptr.

Source/Fractorium/PaletteEditor/PaletteEditor.h

@@ -0,0 +1,78 @@
+#pragma once
+
+#include "FractoriumPch.h"
+#include "ColorPickerWidget.h"
+#include "GradientColorsView.h"
+#include "EmberFile.h"
+#include "ui_PaletteEditor.h"
+
+namespace Ui
+{
+class PaletteEditor;
+}
+
+/// <summary>
+/// Dialog for editing user created palettes.
+/// This will load with all available user created palettes populated in the combo
+/// box. As the user changes the selected index, the palettes for that file
+/// are shown in the list box. The user can click on those and then edit them and either
+/// save it back to the same position in the file, or append it to the end.
+/// They can also click in the name column to set/rename the palette name.
+/// Any changes on this dialog can be "synced". That is, when the Sync checkbox is checked
+/// any changes result in a signal being sent back to the main window.
+/// </summary>
+class PaletteEditor : public QDialog
+{
+	Q_OBJECT
+
+public:
+	explicit PaletteEditor(PaletteList<float>& paletteList, QWidget* p = nullptr);
+
+public:
+	bool Sync();
+	QPixmap* GetBackGround();
+	Palette<float>& GetPalette(int size);
+	void SetPalette(Palette<float>& palette);
+
+signals:
+	void PaletteChanged();
+	void PaletteFileChanged();
+
+private slots:
+	void OnAddColorButtonClicked();
+	void OnRemoveColorButtonClicked();
+	void OnInvertColorsButtonClicked();
+	void OnRandomColorsButtonClicked();
+	void OnDistributeColorsButtonClicked();
+	void OnResetToDefaultButtonClicked();
+	void OnCreatePaletteFromImageButtonClicked();
+	void OnCreatePaletteAgainFromImageButton();
+	void OnColorPickerColorChanged(const QColor& col);
+	void OnArrowDoubleClicked(const GradientArrow& arrow);
+	void OnSyncCheckBoxStateChanged(int state);
+	void OnArrowMoved(qreal lastPos, const GradientArrow& arrow);
+	void OnPaletteFilenameComboChanged(const QString& text);
+	void OnPaletteCellClicked(int row, int col);
+	void OnPaletteCellChanged(int row, int col);
+	void OnNewPaletteFileButtonClicked();
+	void OnCopyPaletteFileButtonClicked();
+	void OnAppendPaletteButtonClicked();
+	void OnOverwritePaletteButtonClicked();
+	void OnDeletePaletteButtonClicked();
+
+private:
+	void EmitPaletteChanged();
+	QStringList SetupOpenImagesDialog();
+	void AddArrow(const QColor& color);
+	map<float, GradientArrow> GetRandomColorsFromImage(QString filename, int numPoints);
+
+	bool m_PaletteFileChanged = false;
+	int m_PaletteIndex = 0;
+	QString m_Filename;
+	string m_CurrentPaletteFilePath;
+	ColorPickerWidget* m_ColorPicker = nullptr;
+	GradientColorsView* m_GradientColorView = nullptr;
+	QFileDialog* m_FileDialog = nullptr;
+	PaletteList<float>& m_PaletteList;
+	std::unique_ptr<Ui::PaletteEditor> ui;
+};