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"

3 files changed, 0 insertions, 12 deletions

diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/data/.gitkeep b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/data/.gitkeep
deleted file mode 100644
index e69de29..0000000
--- a/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/data/.gitkeep
+++ /dev/null
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/mods/HUD Painter/r6/storages/HUDPainter/DEFAULT.json b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/mods/HUD Painter/r6/storages/HUDPainter/DEFAULT.json
deleted file mode 100644
index dd85d0a..0000000
--- a/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/mods/HUD Painter/r6/storages/HUDPainter/DEFAULT.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "propertiesDefault": [
-    {
-      "name": "MainColors.Red",
-      "red": 1.1761,
-      "green": 0.3809,
-      "blue": 0.3476,
-      "alpha": 1
-    }
-  ]
-}
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/overwrite/r6/storages/HUDPainter/TEST.json b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/overwrite/r6/storages/HUDPainter/TEST.json
deleted file mode 100644
index 0967ef4..0000000
--- a/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/overwrite/r6/storages/HUDPainter/TEST.json
+++ /dev/null
@@ -1 +0,0 @@
-{}