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/Sys Globals.cpp

@@ -0,0 +1,46 @@
+	#include "builddefines.h"
+	#include <stdarg.h>
+	#include <stdio.h>
+	#include <wchar.h>
+	#include "types.h"
+	#include "screenids.h"
+	#include "Sys Globals.h"
+	#include "gameloop.h"
+
+
+// External globals
+extern CHAR8	gubFilename[ 200 ]; // symbol already declared globally in editscreen.cpp (jonathanl)
+BOOLEAN			gfEditMode = FALSE;
+extern CHAR8		gDebugStr[128]; // symbol already defined in overhead.cpp (jonathanl)
+CHAR8			gSystemDebugStr[128];
+INT8			gbFPSDisplay = SHOW_MIN_FPS;
+BOOLEAN			gfResetInputCheck = FALSE;
+BOOLEAN			gfGlobalError			= FALSE;
+
+UINT32	guiGameCycleCounter = 0;
+CHAR8	gubErrorText[ 512 ];//for long filenames
+
+BOOLEAN	SET_ERROR( const STR8 String, ...)
+{
+	va_list	ArgPtr;
+
+	va_start(ArgPtr, String);
+	vsprintf( gubErrorText, String, ArgPtr);
+	va_end(ArgPtr);
+
+	SetPendingNewScreen( ERROR_SCREEN );
+
+	gfGlobalError = TRUE;
+
+	return( FALSE );
+}
+
+//create a varible that can be tested outside the pre-compiler convention. 
+// also see its "Sys Globals.h" declaration
+#ifdef JA2BETAVERSION 
+BOOLEAN JA2BETAVERSION_FLAG = 1;
+#else
+BOOLEAN JA2BETAVERSION_FLAG = 0;
+
+#endif
+