Replace a ton of trivial #ifdefs with runtime checks

This one is big, but unless I missed something, should be all be
trivial.

scripted-diff with the following, then manually tweaked whatever needed:
```

if [ $# -ne 3 ]; then
    echo "Usage: $0 '<pattern>' '<replacement>' '<filename>'"
    exit 1
fi

pattern="$1"
replacement="$2"
filename="$3"

if [ ! -f "$filename" ]; then
    echo "Error: File $filename does not exist."
    exit 1
fi

sed -i '/'"$pattern"'/ {
    :loop
    $ !{
        N
        /'"$pattern"'.*\n.*#endif/ {
            s/'"$pattern"'/'"$replacement"'/
            s/#else/} else {/
            s/#endif/}/
            P
            D
        }
        /'"$pattern"'/ b loop
    }
}' "$filename"

echo "Replacement complete in $filename"
```

h/t to Grok2 for the sed command

sgp/WinFont.cpp

@@ -22,6 +22,7 @@
 #include "font.h"
 #include "Font Control.h"
 #include "GameSettings.h"
+#include <language.hpp>
 
 #include <vfs/Tools/vfs_property_container.h>
 
@@ -353,7 +354,7 @@ INT32 CreateWinFont( LOGFONT &logfont )
 	HDC hdc = GetDC(NULL);
 	SelectObject(hdc, hFont);
 
-#ifdef CHINESE
+if(g_lang == i18n::Lang::zh) {
 	SIZE RectSize;
 	wchar_t str[2]=L"\1";
 	for (int i = 1; i<0x80; i++)
@@ -365,7 +366,7 @@ INT32 CreateWinFont( LOGFONT &logfont )
 	str[0] = L'啊';
     GetTextExtentPoint32W( hdc, str, 1, &RectSize );
     WinFonts[iFont].Width[0] = (UINT8)RectSize.cx;
-#endif
+}
 
 	TEXTMETRIC tm;
 	GetTextMetrics(hdc, &tm);
@@ -467,7 +468,7 @@ INT16 WinFontStringPixLength( STR16 string2, INT32 iFont )
 
 	if (pWinFont == NULL) return(0);
 
-#ifdef CHINESE
+if(g_lang == i18n::Lang::zh) {
 	wchar_t *p=string2;
     UINT32 size = 0;
 	while (*p!=0)
@@ -482,7 +483,7 @@ INT16 WinFontStringPixLength( STR16 string2, INT32 iFont )
 		p++;
 	}
 	return size;
-#else
+} else {
 	SIZE RectSize;
 	HDC hdc = GetDC(NULL);
 
@@ -491,7 +492,7 @@ INT16 WinFontStringPixLength( STR16 string2, INT32 iFont )
 	ReleaseDC(NULL, hdc);
 	
 	return( (INT16)RectSize.cx );
-#endif
+}
 }
 
 
@@ -502,11 +503,11 @@ INT16 GetWinFontHeight(INT32 iFont)
 	pWinFont = GetWinFont(iFont);
 
 	if (pWinFont == NULL) return(0);
-#ifdef CHINESE //zwwooooo: Correct tactical interface font height to fixed Chinese characters smearing bug
+if(g_lang == i18n::Lang::zh) { //zwwooooo: Correct tactical interface font height to fixed Chinese characters smearing bug
 	if (iFont == WinFontMap[TINYFONT1] || iFont == WinFontMap[SMALLFONT1] || iFont == WinFontMap[FONT14ARIAL])
 	{
 		return pWinFont->Height + 2;
 	}
-#endif
+}
 	return pWinFont->Height;
 }

sgp/sgp.cpp

@@ -58,6 +58,7 @@
 #endif
 #include <Music Control.h>
 
+#include <language.hpp>
 
 static void MAGIC(std::string const& aarrrrgggh = "")
 {}
@@ -858,13 +859,13 @@ int PASCAL HandledWinMain(HINSTANCE hInstance,	HINSTANCE hPrevInstance, LPSTR pC
 	}
 #endif
 
-#	ifdef ENGLISH
+	if( g_lang == i18n::Lang::en ) {
 	try
 	{
 		SetIntroType( INTRO_SPLASH );
 	}
 	HANDLE_FATAL_ERROR;
-#	endif
+	}
 
 	gfApplicationActive = TRUE;
 	gfProgramIsRunning = TRUE;