[bug] Fatal crash when reset stashed new file in new folder

[NathanBaulch]

Fatal crash when selecting Reset to This Revision on a stash change that introduces a new file in a new folder.
Probably just need a Directory.CreateDirectory(Path.GetDirectoryName(outputFile)) or similar in SaveRevisionFile.ExecCmd.
Also, would be good if the app could catch unexpected errors like this rather than simply disappearing.

System.IO.DirectoryNotFoundException: Could not find a part of the path '/home/nathan/foo/modules/deploy/variables.tf'.
   at Interop.ThrowExceptionForIoErrno(ErrorInfo errorInfo, String path, Boolean isDirError)
   at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String path, OpenFlags flags, Int32 mode, Boolean failForSymlink, Boolean& wasSymlink, Func`4 createOpenException)
   at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, UnixFileMode openPermissions, Int64& fileLength, UnixFileMode& filePermissions, Boolean failForSymlink, Boolean& wasSymlink, Func`4 createOpenException)
   at System.IO.Strategies.OSFileStreamStrategy..ctor(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode)
   at System.IO.File.OpenWrite(String path)
   at SourceGit.Commands.SaveRevisionFile.ExecCmd(String repo, String args, String outputFile, Stream input) in /home/nathan/ghq/github.com/sourcegit-scm/sourcegit/src/Commands/SaveRevisionFile.cs:line 38
   at SourceGit.Commands.SaveRevisionFile.Run(String repo, String revision, String file, String saveTo) in /home/nathan/ghq/github.com/sourcegit-scm/sourcegit/src/Commands/SaveRevisionFile.cs:line 21
   at SourceGit.ViewModels.StashesPage.<>c__DisplayClass24_2.<MakeContextMenuForChange>b__6() in /home/nathan/ghq/github.com/sourcegit-scm/sourcegit/src/ViewModels/StashesPage.cs:line 262
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)

[love-linger]

You can find crash logs from the data storage dir.

sourcegit/README.md

Lines 61 to 71 in 74d77ab

	This software creates a folder `$"{System.Environment.SpecialFolder.ApplicationData}/SourceGit"`, which is platform-dependent, to store user settings, downloaded avatars and crash logs.
	| OS | PATH |
	|---------|-----------------------------------------------------|
	| Windows | `%APPDATA%\SourceGit` |
	| Linux | `${HOME}/.config/SourceGit` or `${HOME}/.sourcegit` |
	| macOS | `${HOME}/Library/Application Support/SourceGit` |
	> [!TIP]
	> * You can open this data storage directory from the main menu `Open Data Storage Directory`.
	> * You can create a `data` folder next to the `SourceGit` executable to force this app to store data (user settings, downloaded avatars and crash logs) into it (Portable-Mode). Only works on Windows.

[love-linger]

Fixed.