Merge branch 'master' into jgrpp-beta

# Conflicts:
#	src/company_cmd.cpp
#	src/economy.cpp
#	src/lang/swedish.txt
#	src/network/network_command.cpp
#	src/news_gui.cpp
#	src/saveload/saveload.h
#	src/script/api/script_list.cpp
#	src/video/cocoa/cocoa_v.mm
#	src/video/sdl2_v.cpp

src/os/unix/unix.cpp

@@ -278,7 +278,7 @@ bool GetClipboardContents(char *buffer, const char *last)
 	}
 
 	char *clip = SDL_GetClipboardText();
-	if (clip != NULL) {
+	if (clip != nullptr) {
 		strecpy(buffer, clip, last);
 		SDL_free(clip);
 		return true;