Merge branch 'master' into jgrpp

# Conflicts:
#	CMakeLists.txt
#	cmake/CompileFlags.cmake
#	src/bridge_gui.cpp
#	src/saveload/afterload.cpp
#	src/saveload/saveload.cpp
#	src/saveload/saveload.h
#	src/saveload/town_sl.cpp
#	src/screenshot.cpp
#	src/screenshot.h
#	src/toolbar_gui.cpp
#	src/town.h
#	src/town_cmd.cpp

src/3rdparty/squirrel/squirrel/sqcompiler.cpp

@@ -65,9 +65,9 @@ public:
 	}
 	NORETURN static void ThrowError(void *ud, const SQChar *s) {
 		SQCompiler *c = (SQCompiler *)ud;
-		c->Error(s);
+		c->Error("%s", s);
 	}
-	NORETURN void Error(const SQChar *s, ...)
+	NORETURN void Error(const SQChar *s, ...) WARN_FORMAT(2, 3)
 	{
 		static SQChar temp[256];
 		va_list vl;
@@ -122,7 +122,7 @@ public:
 					}
 					Error("expected '%s'", etypename);
 				}
-				Error("expected '%c'", tok);
+				Error("expected '%c'", (char)tok);
 			}
 		}
 		SQObjectPtr ret;

src/3rdparty/squirrel/squirrel/sqvm.cpp

@@ -94,7 +94,7 @@ bool SQVM::ARITH_OP(SQUnsignedInteger op,SQObjectPtr &trg,const SQObjectPtr &o1,
 					if(!StringCat(o1, o2, trg)) return false;
 			}
 			else if(!ArithMetaMethod(op,o1,o2,trg)) {
-				Raise_Error("arith op %c on between '%s' and '%s'",op,GetTypeName(o1),GetTypeName(o2)); return false;
+				Raise_Error("arith op %c on between '%s' and '%s'",(char)op,GetTypeName(o1),GetTypeName(o2)); return false;
 			}
 		}
 		return true;

src/3rdparty/squirrel/squirrel/sqvm.h

@@ -81,7 +81,7 @@ public:
 	SQString *PrintObjVal(const SQObject &o);
 
 
-	void Raise_Error(const SQChar *s, ...);
+	void Raise_Error(const SQChar *s, ...) WARN_FORMAT(2, 3);
 	void Raise_Error(SQObjectPtr &desc);
 	void Raise_IdxError(const SQObject &o);
 	void Raise_CompareError(const SQObject &o1, const SQObject &o2);