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Remove unused fns from field.h/.c

--- a/field.c

+++ b/field.c

@@ -68,45 +68,6 @@

   }

 }

-Glyph field_peek(Field* f, Usz y, Usz x) {

-  Usz f_height = f->height;

-  Usz f_width = f->width;

-  assert(y < f_height && x < f_width);

-  if (y >= f_height || x >= f_width)

-    return '\0';

-  return f->buffer[y * f_width + x];

-}

-

-Glyph field_peek_relative(Field* f, Usz y, Usz x, Isz offs_y, Isz offs_x) {

-  Isz f_height = f->height;

-  Isz f_width = f->width;

-  Isz y0 = (Isz)y + offs_y;

-  Isz x0 = (Isz)x + offs_x;

-  if (y0 >= f_height || x0 >= f_width || y0 < 0 || x0 < 0)

-    return '.';

-  return f->buffer[y0 * f_width + x0];

-}

-

-void field_poke(Field* f, Usz y, Usz x, Glyph glyph) {

-  Usz f_height = f->height;

-  Usz f_width = f->width;

-  assert(y < f_height && x < f_width);

-  if (y >= f_height || x >= f_width)

-    return;

-  f->buffer[y * f_width + x] = glyph;

-}

-

-void field_poke_relative(Field* f, Usz y, Usz x, Isz offs_y, Isz offs_x,

-                         Glyph glyph) {

-  Isz f_height = f->height;

-  Isz f_width = f->width;

-  Isz y0 = (Isz)y + offs_y;

-  Isz x0 = (Isz)x + offs_x;

-  if (y0 >= f_height || x0 >= f_width || y0 < 0 || x0 < 0)

-    return;

-  f->buffer[y0 * f_width + x0] = glyph;

-}

-

 static inline bool glyph_char_is_valid(char c) { return c >= '#' && c <= '~'; }

 void field_fput(Field* f, FILE* stream) {

--- a/field.h

+++ b/field.h

@@ -9,12 +9,6 @@

 void field_copy(Field* src, Field* dest);

 void field_fill_subrect(Field* field, Usz y, Usz x, Usz height, Usz width,

                         Glyph fill_char);

-Glyph field_peek(Field* field, Usz y, Usz x);

-Glyph field_peek_relative(Field* field, Usz y, Usz x, Isz offs_y, Isz offs_x);

-void field_poke(Field* field, Usz y, Usz x, Glyph glyph);

-void field_poke_relative(Field* field, Usz y, Usz x, Isz offs_y, Isz offs_x,

-                         Glyph glyph);

-

 void field_fput(Field* field, FILE* stream);

 typedef enum {