Remove vendored usvfs and Windows-only usvfs code paths

The Linux port uses its own in-process FUSE VFS (FuseConnector), so
usvfs was dead weight: libs/usvfs/ was never built, usvfsconnector.cpp
was explicitly REMOVE_ITEM'd from the source list, and every call site
was already guarded by #ifdef _WIN32 with a working Linux branch (the
Windows build is also broken on this branch, since FUSE3 is a hard
find_package dependency).

- Drop libs/usvfs/ and src/src/usvfsconnector.{cpp,h}
- Collapse #ifdef _WIN32 / usvfs include branches in organizercore,
  mainwindow, settings, util, spawn
- Remove getUsvfsVersionString() and the "usvfs: ..." log field
- Remove vfs32/64DLLName APPPARAMs (nothing reads them)
- Relabel About dialog "usvfs:" row to "VFS: FUSE 3"

1 files changed, 0 insertions, 11 deletions

diff --git a/libs/usvfs/test/tinjectlib_test/testinject_dll/main.h b/libs/usvfs/test/tinjectlib_test/testinject_dll/main.h
deleted file mode 100644
index 6faf800..0000000
--- a/libs/usvfs/test/tinjectlib_test/testinject_dll/main.h
+++ /dev/null
@@ -1,11 +0,0 @@
-#pragma once
-
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-
-extern "C"
-    __declspec(dllexport) void __cdecl InitNoQuit(LPVOID userData, size_t userDataSize);
-extern "C" __declspec(dllexport) void __cdecl InitNoParam(LPVOID userData,
-                                                          size_t userDataSize);
-extern "C" __declspec(dllexport) void __cdecl InitComplexParam(LPVOID userData,
-                                                               size_t userDataSize);