Move main executable source to its own directory (#248)

* Move main executable files to their own directory

* Adapt the build to the new file structure

... and fix some weird #include's that were relying on the project root
being an include directory.

Ja2/Ja25Update.h

@@ -0,0 +1,34 @@
+#ifndef JA25UPDATE__C_
+#define JA25UPDATE__C_
+
+#include "Types.h"
+
+#ifdef JA2UB
+
+//Used in the editor to compensate for the 2_<map name>
+#define	JA25_EXP_MAP_NAME_PREFIX						L""
+#define	JA25_EXP_MAP_NAME_SIZE_OFFSET				0
+
+
+//The starting sector of the Expanion pack
+extern INT16 JA2_5_START_SECTOR_X;
+extern INT16 JA2_5_START_SECTOR_Y;
+//#define JA2_5_START_SECTOR_X			7
+//#define JA2_5_START_SECTOR_Y			8
+
+#define 	JA25_PROF_DAT "BINARYDATA\\Ja25Prof.dat"
+
+/*
+BOOLEAN ConvertJa2SaveToJa2_5();
+
+BOOLEAN ImportOldProfilesAndProcessThem();
+
+void GivePlayerStartingJa25Money();
+
+UINT32	HandleDifficultyModifierForImportedGames();
+
+BOOLEAN DoesJa25ImportSaveExistAndSeemValid();
+*/
+#endif
+
+#endif