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

Author: whindsaks

dll/win32/shell32/CDefaultContextMenu.cpp

@@ -23,11 +23,6 @@ SHELL_GetRegCLSID(HKEY hKey, LPCWSTR SubKey, LPCWSTR Value, CLSID &clsid)
     return !err ? CLSIDFromString(buf, &clsid) : HRESULT_FROM_WIN32(err);
 }
 
-static inline bool RegValueExists(HKEY hKey, LPCWSTR Name)
-{
-    return RegQueryValueExW(hKey, Name, NULL, NULL, NULL, NULL) == ERROR_SUCCESS;
-}
-
 static BOOL InsertMenuItemAt(HMENU hMenu, UINT Pos, UINT Flags)
 {
     MENUITEMINFOW mii;