EXTENSION: Add MVD_PEXT1_EXTRA_PFS.

mvdsv and ezQuake had a broken implementation of FTE_PEXT_TRANS since
inception. To fix this, future versions of ezQuake will enable this
extension in which case mvdsv will write extra playerflags.

To accomodate for these bits PF_ONGROUND and PF_SOLID will be moved if
the extra byte is written. This is how FTE client and server works.

src/protocol.h

@@ -78,6 +78,8 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 # define MVD_PEXT1_INCLUDEINMVD      (MVD_PEXT1_HIDDEN_MESSAGES)
 
+# define MVD_PEXT1_EXTRA_PFS         (1 <<  8) // Send extra flags used in conjunction with FTE_PEXT_TRANS
+
 #endif // PROTOCOL_VERSION_MVD1
 
 //=========================================
@@ -291,8 +293,13 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 // bits 11..13 are player move type bits (ZQuake extension)
 #define PF_PMC_SHIFT	11
 #define	PF_PMC_MASK		7
+#ifdef FTE_PEXT_TRANS
+#define	PF_ONGROUND		(1<<22)			// ZQuake extension, 14 offset to extra playerflags
+#define	PF_SOLID		(1<<23)			// ZQuake extension, 15 offset to extra playerflags
+#else
 #define	PF_ONGROUND		(1<<14)			// ZQuake extension
 #define	PF_SOLID		(1<<15)			// ZQuake extension
+#endif
 
 // encoded player move types
 #define PMC_NORMAL				0		// normal ground movement
@@ -362,6 +369,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 # endif // FTE_PEXT_SCALE
 # ifdef FTE_PEXT_TRANS
 #  define U_FTE_TRANS		(1<<1)	//transparency value
+#  define	PF_EXTRA_PFS	(1<<15)	//TRANS requires extra playerflags
 #  define	PF_TRANS_Z		(1<<17)
 # endif // FTE_PEXT_TRANS
 # ifdef FTE_PEXT_FATNESS