many more optimisations. cleaned up fs code. bug fixes etc (see below).

- fix usb using the wrong year when polling the timestamp.
- fs file/dir has been re-written to allow for simplified calling and remove the need of manually closing.
- add SetSize for stdio by using ftruncate.
- don't truncate the file when opened in stdio.
- add getcount api for stdio.
- display file/dir count in filebrowser for non-native fs.
- allow hash to be used on non-native fs.
- slightly optimise nro parsing by manually calculating nro size rather than doing an os call.
- slightly optimise nro parsing by keeping the fs struct alive between calls, rather than creating a new one on the stack.
- fix filebrowser peeking into zip files that are stored on non-sd fs.
- set the timestamp of a file moved to a stdio location (cut/paste).
- slightly optimise daybreak update folder detection by skipping opening/polling the dir size.
- set the fullpath of the file thats being hashed in progress box.

sphaira/source/ui/progress_box.cpp

@@ -256,10 +256,9 @@ auto ProgressBox::ShouldExitResult() -> Result {
 auto ProgressBox::CopyFile(fs::Fs* fs_src, fs::Fs* fs_dst, const fs::FsPath& src_path, const fs::FsPath& dst_path) -> Result {
     fs::File src_file;
     R_TRY(fs_src->OpenFile(src_path, FsOpenMode_Read, &src_file));
-    ON_SCOPE_EXIT(fs_src->FileClose(&src_file));
 
     s64 src_size;
-    R_TRY(fs_src->FileGetSize(&src_file, &src_size));
+    R_TRY(src_file.GetSize(&src_size));
 
     // this can fail if it already exists so we ignore the result.
     // if the file actually failed to be created, the result is implicitly
@@ -268,9 +267,8 @@ auto ProgressBox::CopyFile(fs::Fs* fs_src, fs::Fs* fs_dst, const fs::FsPath& src
 
     fs::File dst_file;
     R_TRY(fs_dst->OpenFile(dst_path, FsOpenMode_Write, &dst_file));
-    ON_SCOPE_EXIT(fs_dst->FileClose(&dst_file));
 
-    R_TRY(fs_dst->FileSetSize(&dst_file, src_size));
+    R_TRY(dst_file.SetSize(src_size));
 
     s64 offset{};
     std::vector<u8> buf(1024*1024*4); // 4MiB
@@ -279,10 +277,10 @@ auto ProgressBox::CopyFile(fs::Fs* fs_src, fs::Fs* fs_dst, const fs::FsPath& src
         R_TRY(ShouldExitResult());
 
         u64 bytes_read;
-        R_TRY(fs_src->FileRead(&src_file, offset, buf.data(), buf.size(), 0, &bytes_read));
+        R_TRY(src_file.Read(offset, buf.data(), buf.size(), 0, &bytes_read));
         Yield();
 
-        R_TRY(fs_dst->FileWrite(&dst_file, offset, buf.data(), bytes_read, FsWriteOption_None));
+        R_TRY(dst_file.Write(offset, buf.data(), bytes_read, FsWriteOption_None));
         Yield();
 
         UpdateTransfer(offset, src_size);