[File Paths] Implement Path Manager (#2440)

* Push up branch for testing

* Path manager

* Tweaks

* Changes

* More path work

* Update paths for eqemu_server.pl

* More path work

* Import and export client files

* Path remove

* More path work

* Update eqemu_config.h

* Fix tests

* Tests disable temp

* Update eqemu_config.h

* Update .drone.yml

* Hook tests back up

* Update main.cpp

* Platform tests

* Fix include

* Use std::filesystem on windows

* Fix IPCMutex name on windows

* std::filesystem changes

* Update path_manager.cpp

* Explicit string cast

* Explicit string cast

* Update path_manager.cpp

* Windows fixes

* Mapped files

* Relative fixes

* Use relative paths off of cwd

* Update Debian image to Debian 11 (updates GCC)

Co-authored-by: hg <4683435+hgtw@users.noreply.github.com>

common/file.h

@@ -0,0 +1,38 @@
+/**
+ * EQEmulator: Everquest Server Emulator
+ * Copyright (C) 2001-2020 EQEmulator Development Team (https://github.com/EQEmu/Server)
+ *
+ * This program 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; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY except by those people which sell it, which
+ * are required to give you total support for your newly bought product;
+ * 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+*/
+
+#ifndef EQEMU_FILE_H
+#define EQEMU_FILE_H
+
+#include <filesystem>
+
+namespace fs = std::filesystem;
+
+class File {
+public:
+	static bool Exists(const std::string &name);
+	static void Makedir(const std::string& directory_name);
+	static std::string FindEqemuConfigPath();
+	static std::string GetCwd();
+};
+
+bool Exists(const std::string& name);
+
+#endif //EQEMU_FILE_H