Add lua selection match method

Also improve the replace_terrain command parameters.

include/sp_lev.h

@@ -164,12 +164,6 @@ typedef struct {
     xchar ter, tlit;
 } terrain;
 
-typedef struct {
-    xchar chance;
-    xchar x1, y1, x2, y2;
-    xchar fromter, toter, tolit;
-} replaceterrain;
-
 typedef struct {
     struct {
         xchar room;
@@ -186,12 +180,9 @@ typedef struct _room {
     xchar rtype, chance, rlit, filled, joined;
 } room;
 
-typedef struct {
-    schar zaligntyp;
-    schar keep_region;
-    schar halign, valign;
-    char xsize, ysize;
-    char **map;
-} mazepart;
+struct mapfragment {
+    int wid, hei;
+    char *data;
+};
 
 #endif /* SP_LEV_H */