Add proper support for CIA title keys

1. Support for `ticket.db`
2. Support for `gm9/support/encTitleKeys.bin`
3. Set the title key and common key index when building standard CIA

src/core/title_keys_bin.h

@@ -0,0 +1,44 @@
+// Copyright 2021 threeSD Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <unordered_map>
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+#include "common/swap.h"
+
+namespace Core {
+
+struct TitleKeysBinHeader {
+    u32_le num_entries;
+    INSERT_PADDING_BYTES(12);
+};
+static_assert(sizeof(TitleKeysBinHeader) == 16);
+
+struct TitleKeysBinEntry {
+    u32_be common_key_index;
+    INSERT_PADDING_BYTES(4);
+    u64_be title_id;
+    std::array<u8, 16> title_key;
+};
+static_assert(sizeof(TitleKeysBinEntry) == 32);
+
+// GM9 support files encTitleKeys.bin and decTitleKeys.bin.
+class TitleKeysBin {
+public:
+    explicit TitleKeysBin(const std::string& path);
+    ~TitleKeysBin();
+
+    bool IsGood() const;
+
+    std::unordered_map<u64, TitleKeysBinEntry> entries;
+
+private:
+    bool Load(const std::string& path);
+    bool is_good = false;
+};
+
+} // namespace Core