Simdify Platform

Updated <FileSystem>::FindFileExtension( ... ) and <FileSystem>::FindFiles( ... ) to have a fourth function parameter that allows you to choose whether or not directory searches use recursion. Previously, recursion was always used. This should make it easier to use directory searches, without requiring custom code to remove unwanted items from the search results.

Fixed bugs in <FileSystem>. Some of the file system data interfaces mistakenly used a reverse_directory_iterator instead of directory_iterator. In some cases, with some combinations of search parameters, this could cause a directory search operation to enter an infinite loop.