Refactoring: rename tools/editor/ to editor/

The other subfolders of tools/ had already been moved to either
editor/, misc/ or thirdparty/, so the hiding the editor code that
deep was no longer meaningful.

(Manual redo of 49c065d29c)

editor/plugins/texture_editor_plugin.h

@@ -0,0 +1,49 @@
+#ifndef TEXTURE_EDITOR_PLUGIN_H
+#define TEXTURE_EDITOR_PLUGIN_H
+
+
+
+#include "editor/editor_plugin.h"
+#include "editor/editor_node.h"
+#include "scene/resources/texture.h"
+
+
+class TextureEditor : public Control {
+
+	OBJ_TYPE(TextureEditor, Control);
+
+
+	Ref<Texture> texture;
+
+protected:
+	void _notification(int p_what);
+	void _input_event(InputEvent p_event);
+	static void _bind_methods();
+public:
+
+	void edit(Ref<Texture> p_texture);
+	TextureEditor();
+};
+
+
+class TextureEditorPlugin : public EditorPlugin {
+
+	OBJ_TYPE( TextureEditorPlugin, EditorPlugin );
+
+	TextureEditor *texture_editor;
+	EditorNode *editor;
+
+public:
+
+	virtual String get_name() const { return "Texture"; }
+	bool has_main_screen() const { return false; }
+	virtual void edit(Object *p_node);
+	virtual bool handles(Object *p_node) const;
+	virtual void make_visible(bool p_visible);
+
+	TextureEditorPlugin(EditorNode *p_node);
+	~TextureEditorPlugin();
+
+};
+
+#endif // TEXTURE_EDITOR_PLUGIN_H