`gsKit_fontm_print_scaled`: Alignment does not take into account special characters

[ticky]

When printing characters in the JIS range using the \f prefix in the gsFontM module, centered or right-aligned text is measured based on the full string length including the four digit character code and the \f character.

i.e. a string of "\f0062 Enter" is treated as 11 characters long, rather than 7.

The same goes for the \e helper, though due to the variable lengths this one probably requires a more complex solution.

I haven't been able to build gsKit myself but I believe this patch would help, if my maths is right, presuming that the programmer didn't input an invalid character code:

diff --git a/ee/gs/src/gsFontM.c b/ee/gs/src/gsFontM.c
index 983e05e..0f189d7 100644
--- a/ee/gs/src/gsFontM.c
+++ b/ee/gs/src/gsFontM.c
@@ -357,6 +357,11 @@ void gsKit_fontm_print_scaled(GSGLOBAL *gsGlobal, GSFONTM *gsFontM, float X, flo
            numlines++;
            linechars[numlines] = 0;
        }
+       else if(cur == '\f')
+       {
+           linechars[numlines]++;
+           pos += 4;
+       }
        else if(cur == '\t' && gsFontM->Align != GSKIT_FALIGN_LEFT)
        {
            printf("WARNING: Tabs not supported in GSKIT_FALIGN_CENTER/RIGHT\n");