[SHELL32] File Types dialog: Add functionality, optimize loading time (#6122)

- Support loading protocols like XP
- Support most of the relevant EditFlags
- Support reading/writing the AlwaysShowExt and BrowserFlags properties
- Loads the list much faster with optimized code and delaying the large icon and description string
- Reduce the number of magic buffer sizes by replacing them with defines that are in the ballpark of being correct
- Implemented column sorting
- Removed custom icon extraction code
- Removed IDS_FILE_EXT_TYPE string because it must be the same as IDS_ANY_FILE
- Don't touch verb keys that are not edited to retain the original REG type
- Don't clobber unchanged %1 icon location when editing a type

CORE-19756

dll/win32/shell32/utils.h

@@ -0,0 +1,47 @@
+/*
+ * PROJECT:     shell32
+ * LICENSE:     LGPL-2.1+ (https://spdx.org/licenses/LGPL-2.1+)
+ * PURPOSE:     Utility functions
+ * COPYRIGHT:   ReactOS Team
+ */
+
+#pragma once
+
+inline BOOL
+RegValueExists(HKEY hKey, LPCWSTR Name)
+{
+    return RegQueryValueExW(hKey, Name, NULL, NULL, NULL, NULL) == ERROR_SUCCESS;
+}
+
+inline BOOL
+RegKeyExists(HKEY hKey, LPCWSTR Path)
+{
+    BOOL ret = !RegOpenKeyExW(hKey, Path, 0, MAXIMUM_ALLOWED, &hKey);
+    if (ret)
+        RegCloseKey(hKey);
+    return ret;
+}
+
+inline DWORD
+RegSetOrDelete(HKEY hKey, LPCWSTR Name, DWORD Type, LPCVOID Data, DWORD Size)
+{
+    if (Data)
+        return RegSetValueExW(hKey, Name, 0, Type, LPBYTE(Data), Size);
+    else
+        return RegDeleteValueW(hKey, Name);
+}
+
+inline DWORD
+RegSetString(HKEY hKey, LPCWSTR Name, LPCWSTR Str, DWORD Type = REG_SZ)
+{
+    return RegSetValueExW(hKey, Name, 0, Type, LPBYTE(Str), (lstrlenW(Str) + 1) * sizeof(WCHAR));
+}
+
+// SHExtractIconsW is a forward, use this function instead inside shell32
+inline HICON
+SHELL32_SHExtractIcon(LPCWSTR File, int Index, int cx, int cy)
+{
+    HICON hIco;
+    int r = PrivateExtractIconsW(File, Index, cx, cy, &hIco, NULL, 1, 0);
+    return r > 0 ? hIco : NULL;
+}