Uses std::uint16_t for SubsystemId enum

Ensures consistency by using `std::uint16_t` instead of `uint16_t` for the `SubsystemId` enum.

Relates to feature/pe_scanner

include/omath/system/pe/dos_header.hpp

@@ -7,7 +7,7 @@
 
 namespace omath::system::pe
 {
-    struct DosHeader
+    struct DosHeader final
     {
         std::uint16_t e_magic;
         std::uint16_t e_cblp;

include/omath/system/pe/file_header.hpp

@@ -43,7 +43,7 @@ namespace omath::system::pe
         CEE = 0xC0EE,
     };
 
-    struct FileHeader
+    struct FileHeader final
     {
         MachineId machine;
         uint16_t num_sections;

include/omath/system/pe/image_nt_headers.hpp

@@ -14,7 +14,7 @@ namespace omath::system::pe
         x64_bit,
     };
     template<NtArchitecture architecture>
-    struct ImageNtHeaders
+    struct ImageNtHeaders final
     {
         std::uint32_t signature;
         FileHeader file_header;

include/omath/system/pe/optional_header.hpp

@@ -8,71 +8,71 @@ namespace omath::system::pe
 {
     static constexpr std::uint16_t opt_hdr32_magic = 0x010B;
     static constexpr std::uint16_t opt_hdr64_magic = 0x020B;
-    enum class SubsystemId : uint16_t
+    enum class SubsystemId : std::uint16_t
     {
-        unknown = 0x0000, // Unknown subsystem.
+        unknown = 0x0000,
-        native = 0x0001, // Image doesn't require a subsystem.
+        native = 0x0001,
-        windows_gui = 0x0002, // Image runs in the Windows GUI subsystem.
+        windows_gui = 0x0002,
-        windows_cui = 0x0003, // Image runs in the Windows character subsystem
+        windows_cui = 0x0003,
-        os2_cui = 0x0005, // image runs in the OS/2 character subsystem.
+        os2_cui = 0x0005,
-        posix_cui = 0x0007, // image runs in the Posix character subsystem.
+        posix_cui = 0x0007,
-        native_windows = 0x0008, // image is a native Win9x driver.
+        native_windows = 0x0008,
-        windows_ce_gui = 0x0009, // Image runs in the Windows CE subsystem.
+        windows_ce_gui = 0x0009,
-        efi_application = 0x000A, //
+        efi_application = 0x000A,
-        efi_boot_service_driver = 0x000B, //
+        efi_boot_service_driver = 0x000B,
-        efi_runtime_driver = 0x000C, //
+        efi_runtime_driver = 0x000C,
         efi_rom = 0x000D,
         xbox = 0x000E,
         windows_boot_application = 0x0010,
         xbox_code_catalog = 0x0011,
     };
 
-    struct DataDirectory
+    struct DataDirectory final
     {
-        uint32_t rva;
+        std::uint32_t rva;
-        uint32_t size;
+        std::uint32_t size;
     };
-    struct OptionalHeaderX64
+    struct OptionalHeaderX64 final
     {
         // Standard fields.
-        uint16_t magic;
+        std::uint16_t magic;
         std::uint16_t linker_version;
 
-        uint32_t size_code;
+        std::uint32_t size_code;
-        uint32_t size_init_data;
+        std::uint32_t size_init_data;
-        uint32_t size_uninit_data;
+        std::uint32_t size_uninit_data;
 
-        uint32_t entry_point;
+        std::uint32_t entry_point;
-        uint32_t base_of_code;
+        std::uint32_t base_of_code;
 
         // NT additional fields.
-        uint64_t image_base;
+        std::uint64_t image_base;
-        uint32_t section_alignment;
+        std::uint32_t section_alignment;
-        uint32_t file_alignment;
+        std::uint32_t file_alignment;
 
         std::uint32_t os_version;
         std::uint32_t img_version;
         std::uint32_t subsystem_version;
-        uint32_t win32_version_value;
+        std::uint32_t win32_version_value;
 
-        uint32_t size_image;
+        std::uint32_t size_image;
-        uint32_t size_headers;
+        std::uint32_t size_headers;
 
-        uint32_t checksum;
+        std::uint32_t checksum;
         SubsystemId subsystem;
-        SubsystemId characteristics;
+        std::uint16_t characteristics;
 
-        uint64_t size_stack_reserve;
+        std::uint64_t size_stack_reserve;
-        uint64_t size_stack_commit;
+        std::uint64_t size_stack_commit;
-        uint64_t size_heap_reserve;
+        std::uint64_t size_heap_reserve;
-        uint64_t size_heap_commit;
+        std::uint64_t size_heap_commit;
 
-        uint32_t ldr_flags;
+        std::uint32_t ldr_flags;
 
-        uint32_t num_data_directories;
+        std::uint32_t num_data_directories;
         DataDirectory data_directories[16];
     };
-    struct OptionalHeaderX86
+    struct OptionalHeaderX86 final
     {
         // Standard fields.
         uint16_t magic;

include/omath/system/pe/section_header.hpp

@@ -9,7 +9,7 @@
 //
 namespace omath::system::pe
 {
-    struct SectionHeader
+    struct SectionHeader final
     {
         char name[8];
         union