Merge branch 'save_ext' into jgrpp

# Conflicts:
#	Makefile.src.in
#	findversion.sh
#	projects/determineversion.vbs
#	src/gamelog.cpp
#	src/gamelog_internal.h
#	src/lang/german.txt
#	src/lang/korean.txt
#	src/network/core/config.h
#	src/network/network.cpp
#	src/network/network_udp.cpp
#	src/rev.h
#	src/saveload/afterload.cpp
#	src/saveload/company_sl.cpp
#	src/saveload/depot_sl.cpp
#	src/saveload/gamelog_sl.cpp
#	src/saveload/misc_sl.cpp
#	src/saveload/order_sl.cpp
#	src/saveload/saveload.cpp
#	src/saveload/station_sl.cpp
#	src/saveload/town_sl.cpp
#	src/saveload/vehicle_sl.cpp
#	src/table/settings.ini
#	src/viewport.cpp

src/saveload/extended_ver_sl.h

@@ -16,6 +16,8 @@
 
 #include <vector>
 
+enum SaveLoadVersion : uint16;
+
 /**
  * List of extended features, each feature has its own (16 bit) version
  */
@@ -112,7 +114,7 @@ struct SlXvFeatureTest {
 	SlXvFeatureTest(TestFunctorPtr functor_)
 			: min_version(0), max_version(0), feature(XSLFI_NULL), op(XSLFTO_OR), functor(functor_) { }
 
-	bool IsFeaturePresent(uint16 savegame_version, uint16 savegame_version_from, uint16 savegame_version_to) const;
+	bool IsFeaturePresent(SaveLoadVersion savegame_version, SaveLoadVersion savegame_version_from, SaveLoadVersion savegame_version_to) const;
 };
 
 bool SlXvIsFeaturePresent(SlXvFeatureIndex feature, uint16 min_version = 1, uint16 max_version = 0xFFFF);