fix cppcoreguidelines-*

* cppcoreguidelines-init-variables
* cppcoreguidelines-c-copy-assignment-signature
* cppcoreguidelines-macro-usage
* cppcoreguidelines-non-private-member-variables-in-classes
* cppcoreguidelines-pro-type-member-init
* cppcoreguidelines-slicing
* cppcoreguidelines-special-member-functions
* cppcoreguidelines-virtual-class-destructor

src/Base/FileInfo.cpp

@@ -401,7 +401,9 @@ bool FileInfo::isFile() const
         }
         return ok;
 #else
-        struct stat st;
+        // clang-format off
+        struct stat st {};
+        // clang-format on
         if (stat(FileName.c_str(), &st) != 0) {
             return false;
         }