Merge branch 'master' into jgrpp

# Conflicts:
#	src/os/windows/crashlog_win.cpp
#	src/os/windows/font_win32.cpp
#	src/os/windows/win32.cpp
#	src/os/windows/win32.h
#	src/video/win32_v.cpp
#	src/video/win32_v.h

src/os/windows/library_loader_win.cpp

@@ -0,0 +1,59 @@
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD 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.
+ * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file library_loader_win.cpp Implementation of the LibraryLoader for Windows */
+
+#include "../../stdafx.h"
+
+#include <windows.h>
+
+#include "../../library_loader.h"
+#include "../../core/format.hpp"
+
+#include "../../safeguards.h"
+
+static std::string GetLoadError()
+{
+	auto error_code = GetLastError();
+
+	char buffer[512];
+	if (FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, nullptr, error_code,
+		MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buffer, sizeof(buffer), nullptr) == 0) {
+		return fmt::format("Unknown error {}", error_code);
+	}
+
+	return buffer;
+}
+
+void *LibraryLoader::OpenLibrary(const std::string &filename)
+{
+	void *h = ::LoadLibraryW(OTTD2FS(filename).c_str());
+	if (h == nullptr) {
+		this->error = GetLoadError();
+	}
+
+	return h;
+}
+
+void LibraryLoader::CloseLibrary()
+{
+	HMODULE handle = static_cast<HMODULE>(this->handle);
+
+	::FreeLibrary(handle);
+}
+
+void *LibraryLoader::GetSymbol(const std::string &symbol_name)
+{
+	HMODULE handle = static_cast<HMODULE>(this->handle);
+
+	void *p = reinterpret_cast<void *>(::GetProcAddress(handle, symbol_name.c_str()));
+	if (p == nullptr) {
+		this->error = GetLoadError();
+	}
+
+	return p;
+}