Save fixes (#1031)

* Add ElfInfo to track current game info in a singleton

* SaveData compatibility with old firmwares

* sceKernelOpen: fix for write-only mode

* imgui: add font to render non-ascii characters

* save_data: fix Backup Job including old backup in the new backup

* Save backup: fix to avoid filling the queue

 Also limiting 1 backup / 10sec

* Save backup: fix search not handling empty pattern

*backup time improv

src/common/elf_info.h

@@ -0,0 +1,72 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <string>
+#include <string_view>
+
+#include "assert.h"
+#include "singleton.h"
+#include "types.h"
+
+namespace Core {
+class Emulator;
+}
+
+namespace Common {
+
+class ElfInfo {
+    friend class Core::Emulator;
+
+    bool initialized = false;
+
+    std::string game_serial{};
+    std::string title{};
+    std::string app_ver{};
+    u32 firmware_ver = 0;
+    u32 raw_firmware_ver = 0;
+
+public:
+    static constexpr u32 FW_15 = 0x1500000;
+    static constexpr u32 FW_16 = 0x1600000;
+    static constexpr u32 FW_17 = 0x1700000;
+    static constexpr u32 FW_20 = 0x2000000;
+    static constexpr u32 FW_25 = 0x2500000;
+    static constexpr u32 FW_30 = 0x3000000;
+    static constexpr u32 FW_40 = 0x4000000;
+    static constexpr u32 FW_45 = 0x4500000;
+    static constexpr u32 FW_50 = 0x5000000;
+    static constexpr u32 FW_80 = 0x8000000;
+
+    static ElfInfo& Instance() {
+        return *Singleton<ElfInfo>::Instance();
+    }
+
+    [[nodiscard]] std::string_view GameSerial() const {
+        ASSERT(initialized);
+        return Instance().game_serial;
+    }
+
+    [[nodiscard]] std::string_view Title() const {
+        ASSERT(initialized);
+        return title;
+    }
+
+    [[nodiscard]] std::string_view AppVer() const {
+        ASSERT(initialized);
+        return app_ver;
+    }
+
+    [[nodiscard]] u32 FirmwareVer() const {
+        ASSERT(initialized);
+        return firmware_ver;
+    }
+
+    [[nodiscard]] u32 RawFirmwareVer() const {
+        ASSERT(initialized);
+        return raw_firmware_ver;
+    }
+};
+
+} // namespace Common