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, 57 deletions

diff --git a/libs/usvfs/src/shared/stringutils.h b/libs/usvfs/src/shared/stringutils.h
deleted file mode 100644
index 64d0af7..0000000
--- a/libs/usvfs/src/shared/stringutils.h
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
-Userspace Virtual Filesystem
-
-Copyright (C) 2015 Sebastian Herbord. All rights reserved.
-
-This file is part of usvfs.
-
-usvfs is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-usvfs is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with usvfs. If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-
-namespace usvfs::shared
-{
-
-void strncpy_sz(char* dest, const char* src, size_t destSize);
-void wcsncpy_sz(wchar_t* dest, const wchar_t* src, size_t destSize);
-
-bool startswith(const wchar_t* string, const wchar_t* subString);
-
-// Return path when appended to a_From will resolve to same as a_To
-fs::path make_relative(const fs::path& from, const fs::path& to);
-
-std::string to_hex(void* bufferIn, size_t bufferSize);
-
-// convert unicode string to upper-case (locale invariant)
-std::wstring to_upper(const std::wstring& input);
-
-// formats a number with thousand separators and B at the end
-//
-std::string byte_string(std::size_t n);
-
-class FormatGuard
-{
-  std::ostream& m_Stream;
-  std::ios::fmtflags m_Flags;
-
-public:
-  FormatGuard(std::ostream& stream) : m_Stream(stream), m_Flags(stream.flags()) {}
-
-  ~FormatGuard() { m_Stream.flags(m_Flags); }
-
-  FormatGuard(const FormatGuard&)      = delete;
-  FormatGuard& operator=(FormatGuard&) = delete;
-};
-
-}  // namespace usvfs::shared