Bring back script encryption in export preset

Retrieved working implementation from 2.1 branch and adapted to
existing export preset system.

Added Script tab in export preset to export script as raw text,
compiled, or encrypted (same as in 2.1). The script encryption key is
visually validated. The script export mode and the key is saved per
per preset in `export_presets.cfg`, so it makes sense to ignore this
file in version control system.

Each custom exporting procedure can retrieve an export preset set
during project exporting. Refactored project export dialog a bit to
allow easier code comprehension.

editor/editor_export.cpp

@@ -222,10 +222,33 @@ String EditorExportPreset::get_custom_features() const {
 	return custom_features;
 }
 
+void EditorExportPreset::set_script_export_mode(int p_mode) {
+
+	script_mode = p_mode;
+	EditorExport::singleton->save_presets();
+}
+
+int EditorExportPreset::get_script_export_mode() const {
+
+	return script_mode;
+}
+
+void EditorExportPreset::set_script_encryption_key(const String &p_key) {
+
+	script_key = p_key;
+	EditorExport::singleton->save_presets();
+}
+
+String EditorExportPreset::get_script_encryption_key() const {
+
+	return script_key;
+}
+
 EditorExportPreset::EditorExportPreset() :
 		export_filter(EXPORT_ALL_RESOURCES),
 		export_path(""),
-		runnable(false) {
+		runnable(false),
+		script_mode(MODE_SCRIPT_COMPILED) {
 }
 
 ///////////////////////////////////
@@ -474,6 +497,18 @@ void EditorExportPlatform::_edit_filter_list(Set<String> &r_list, const String &
 	memdelete(da);
 }
 
+void EditorExportPlugin::set_export_preset(const Ref<EditorExportPreset> &p_preset) {
+
+	if (p_preset.is_valid()) {
+		export_preset = p_preset;
+	}
+}
+
+Ref<EditorExportPreset> EditorExportPlugin::get_export_preset() const {
+
+	return export_preset;
+}
+
 void EditorExportPlugin::add_file(const String &p_path, const Vector<uint8_t> &p_file, bool p_remap) {
 
 	ExtraFile ef;
@@ -658,6 +693,9 @@ Error EditorExportPlatform::export_project_files(const Ref<EditorExportPreset> &
 
 	Vector<Ref<EditorExportPlugin> > export_plugins = EditorExport::get_singleton()->get_export_plugins();
 	for (int i = 0; i < export_plugins.size(); i++) {
+
+		export_plugins.write[i]->set_export_preset(p_preset);
+
 		if (p_so_func) {
 			for (int j = 0; j < export_plugins[i]->shared_objects.size(); j++) {
 				p_so_func(p_udata, export_plugins[i]->shared_objects[j]);
@@ -1048,6 +1086,7 @@ void EditorExport::_save() {
 		config->set_value(section, "platform", preset->get_platform()->get_name());
 		config->set_value(section, "runnable", preset->is_runnable());
 		config->set_value(section, "custom_features", preset->get_custom_features());
+
 		bool save_files = false;
 		switch (preset->get_export_filter()) {
 			case EditorExportPreset::EXPORT_ALL_RESOURCES: {
@@ -1071,6 +1110,8 @@ void EditorExport::_save() {
 		config->set_value(section, "exclude_filter", preset->get_exclude_filter());
 		config->set_value(section, "export_path", preset->get_export_path());
 		config->set_value(section, "patch_list", preset->get_patches());
+		config->set_value(section, "script_export_mode", preset->get_script_export_mode());
+		config->set_value(section, "script_encryption_key", preset->get_script_encryption_key());
 
 		String option_section = "preset." + itos(i) + ".options";
 
@@ -1233,6 +1274,13 @@ void EditorExport::load_config() {
 			preset->add_patch(patch_list[i]);
 		}
 
+		if (config->has_section_key(section, "script_export_mode")) {
+			preset->set_script_export_mode(config->get_value(section, "script_export_mode"));
+		}
+		if (config->has_section_key(section, "script_encryption_key")) {
+			preset->set_script_encryption_key(config->get_value(section, "script_encryption_key"));
+		}
+
 		String option_section = "preset." + itos(index) + ".options";
 
 		List<String> options;

editor/editor_export.h

@@ -52,6 +52,12 @@ class EditorExportPreset : public Reference {
 		EXPORT_SELECTED_RESOURCES,
 	};
 
+	enum ScriptExportMode {
+		MODE_SCRIPT_TEXT,
+		MODE_SCRIPT_COMPILED,
+		MODE_SCRIPT_ENCRYPTED,
+	};
+
 private:
 	Ref<EditorExportPlatform> platform;
 	ExportFilter export_filter;
@@ -75,6 +81,9 @@ class EditorExportPreset : public Reference {
 
 	String custom_features;
 
+	int script_mode;
+	String script_key;
+
 protected:
 	bool _set(const StringName &p_name, const Variant &p_value);
 	bool _get(const StringName &p_name, Variant &r_ret) const;
@@ -118,6 +127,12 @@ class EditorExportPreset : public Reference {
 	void set_export_path(const String &p_path);
 	String get_export_path() const;
 
+	void set_script_export_mode(int p_mode);
+	int get_script_export_mode() const;
+
+	void set_script_encryption_key(const String &p_key);
+	String get_script_encryption_key() const;
+
 	const List<PropertyInfo> &get_properties() const { return properties; }
 
 	EditorExportPreset();
@@ -260,6 +275,8 @@ class EditorExportPlugin : public Reference {
 
 	friend class EditorExportPlatform;
 
+	Ref<EditorExportPreset> export_preset;
+
 	Vector<SharedObject> shared_objects;
 	struct ExtraFile {
 		String path;
@@ -294,6 +311,9 @@ class EditorExportPlugin : public Reference {
 	void _export_end_script();
 
 protected:
+	void set_export_preset(const Ref<EditorExportPreset> &p_preset);
+	Ref<EditorExportPreset> get_export_preset() const;
+
 	void add_file(const String &p_path, const Vector<uint8_t> &p_file, bool p_remap);
 	void add_shared_object(const String &p_path, const Vector<String> &tags);