[common] rework BitField and BitUtil, use concepts whenever possible (#4076)

test no regressions especially on Liiinux

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4076
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

src/common/fs/file.h

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -277,13 +280,11 @@ public:
      * @returns Count of T data successfully read.
      */
     template <typename T>
+        requires std::is_trivially_copyable_v<T>
     [[nodiscard]] size_t ReadSpan(std::span<T> data) const {
-        static_assert(std::is_trivially_copyable_v<T>, "Data type must be trivially copyable.");
-
         if (!IsOpen()) {
             return 0;
         }
-
         return std::fread(data.data(), sizeof(T), data.size(), file);
     }