Nyx: emuMMC Manage window, Tools UI, and misc updates

- Add gui_emu_tools: emuMMC Manage window with correct positioning (LV_PROTECT_PARENT + re-parent to win)
- Tools: single SD button (tap = SD partition manager, 3s hold = eMMC)
- Remove emuSD from Nyx UI (tabs, UMS, partition manager); keep bootloader emusd
- Shorten Create emuMMC description text by one character
- Storage/build/config and dependency updates

Co-authored-by: Cursor <cursoragent@cursor.com>

bootloader/storage/emusd.h

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2019-2021 CTCaer
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _EMUSD_H
+#define _EMUSD_H
+
+#include <bdk.h>
+
+typedef struct _emusd_cfg_t
+{
+	int   enabled;
+	u64   sector;
+	u32   id;
+	char *path;
+	// Internal.
+	int fs_ver;
+	char *emummc_file_based_path;
+
+} emusd_cfg_t;
+
+extern emusd_cfg_t emu_sd_cfg;
+
+void emusd_load_cfg();
+bool emusd_set_path(char *path);
+int  emusd_storage_init_mmc();
+int  emusd_storage_end();
+int  emusd_storage_read(u32 sector, u32 num_sectors, void *buf);
+int  emusd_storage_write(u32 sector, u32 num_sectors, void *buf);
+sdmmc_storage_t *emusd_get_storage();
+bool emusd_is_gpt();
+int emusd_get_fs_type();
+bool emusd_mount();
+bool emusd_unmount();
+void *emusd_file_read(const char *path, u32 *fsize);
+
+#endif