Added new ENGINE stocks and natives

plugins/include/engine_const.inc

@@ -307,4 +307,49 @@ enum {
 #define EF_INVLIGHT		16		/* get lighting from ceiling */
 #define EF_NOINTERP		32		/* don't interpolate the next frame */
 #define EF_LIGHT		64		/* rocket flare glow sprite */
-#define EF_NODRAW		128		/* don't draw entity */
+#define EF_NODRAW		128		/* don't draw entity */
+
+enum {
+    // Edict
+    GL_trace_ent = 0,
+
+    // Float
+    GL_coop,
+    GL_deathmatch,
+    GL_force_retouch,
+    GL_found_secrets,
+    GL_frametime,
+    GL_serverflags,
+    GL_teamplay,
+    GL_time,
+    GL_trace_allsolid,
+    GL_trace_fraction,
+    GL_trace_inopen,
+    GL_trace_inwater,
+    GL_trace_plane_dist,
+    GL_trace_startsolid,
+
+    // Int
+    GL_cdAudioTrack,
+    GL_maxClients,
+    GL_maxEntities,
+    GL_msg_entity,
+    GL_trace_flags,
+    GL_trace_hitgroup,
+
+    // String
+    GL_pStringBase,
+    GL_mapname,
+    GL_startspot,
+
+    // Vector
+    GL_trace_endpos,
+    GL_trace_plane_normal,
+    GL_v_forward,
+    GL_v_right,
+    GL_v_up,
+    GL_vecLandmarkOffset,
+
+    // Void (not supported)
+    GL_pSaveData
+}