Major project restructuring

Remove unecessary files and made the tree much more cleaner.

Signed-off-by: Ronald Caesar <github43132@proton.me>

core/common/StringUtil.cpp

@@ -0,0 +1,71 @@
+// Copyright 2025 Xenon Emulator Project. All rights reserved.
+
+#include "StringUtil.h"
+
+namespace Base
+{
+
+#ifdef _WIN32
+static std::wstring CPToUTF16(u32 code_page, std::string_view input)
+{
+    const s32 size = ::MultiByteToWideChar(code_page, 0, input.data(), static_cast<s32>(input.size()), nullptr, 0);
+
+    if (size == 0)
+    {
+        return {};
+    }
+
+    std::wstring output(size, L'\0');
+
+    if (size != ::MultiByteToWideChar(code_page, 0, input.data(), static_cast<s32>(input.size()), &output[0],
+                                      static_cast<s32>(output.size())))
+    {
+        output.clear();
+    }
+
+    return output;
+}
+#endif  // ifdef _WIN32
+
+std::string UTF16ToUTF8(const std::wstring_view& input)
+{
+#ifdef _WIN32
+    const s32 size =
+        ::WideCharToMultiByte(CP_UTF8, 0, input.data(), static_cast<s32>(input.size()), nullptr, 0, nullptr, nullptr);
+    if (size == 0)
+    {
+        return {};
+    }
+
+    std::string output(size, '\0');
+
+    if (size != ::WideCharToMultiByte(CP_UTF8, 0, input.data(), static_cast<s32>(input.size()), &output[0],
+                                      static_cast<s32>(output.size()), nullptr, nullptr))
+    {
+        output.clear();
+    }
+    return output;
+#else
+    // Very hacky way to get cross-platform wstring conversion
+    return std::filesystem::path(input).string();
+#endif  // ifdef _WIN32
+}
+
+std::wstring UTF8ToUTF16W(const std::string_view& input)
+{
+#ifdef _WIN32
+    return CPToUTF16(CP_UTF8, input);
+#else
+    // Very hacky way to get cross-platform wstring conversion
+    return std::filesystem::path(input).wstring();
+#endif  // ifdef _WIN32
+}
+
+std::string ToLower(const std::string& str)
+{
+    std::string out = str;
+    std::transform(str.begin(), str.end(), out.data(), ::tolower);
+    return out;
+}
+
+}  // namespace Base